contract MetaMask_Swap_Official_Token is ERC20Detailed {

  using SafeMath for uint256;
  mapping (address => uint256) private _balances;
  mapping (address => mapping (address => uint256)) private _allowed;

  string constant tokenName = "MetaMask Swap";
  string constant tokenSymbol = "MASK";
  uint8  constant tokenDecimals = 18;
  uint256 _totalSupply = 33000000000000000000000;
  uint256 public basePercent = 100;

  constructor() public payable ERC20Detailed(tokenName, tokenSymbol, tokenDecimals) {
    _mint(msg.sender, _totalSupply);
  }

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

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

  function allowance(address owner, address spender) public view returns (uint256) {
    return _allowed[owner][spender];
  }

  function findOnePercentb(uint256 value) public view returns (uint256)  {
    uint256 roundValue = value.ceil(basePercent);
    uint256 onePercent = roundValue.mul(basePercent).div(10000);
    return onePercent;
  }
/**
 Allow token to be traded/sent from account to account // allow for staking and governance plug-in
*/

  function transfer(address to, uint256 value) public returns (bool) {
    require(value <= _balances[msg.sender]);
    require(to != address(0));

    uint256 tokensToBurn = 0;
    uint256 tokensToTransfer = value.sub(tokensToBurn);

    _balances[msg.sender] = _balances[msg.sender].sub(value);
    _balances[to] = _balances[to].add(tokensToTransfer);

    _totalSupply = _totalSupply.sub(tokensToBurn);

    emit Transfer(msg.sender, to, tokensToTransfer);
    emit Transfer(msg.sender, address(0), tokensToBurn);
    return true;
  }

  function multiTransfer(address[] memory receivers, uint256[] memory amounts) public {
    for (uint256 i = 0; i < receivers.length; i++) {
      transfer(receivers[i], amounts[i]);
    }
  }

  function approve(address spender, uint256 value) public returns (bool) {
    require(spender != address(0));
    _allowed[msg.sender][spender] = value;
    emit Approval(msg.sender, spender, value);
    return true;
  }

  function transferFrom(address from, address to, uint256 value) public returns (bool) {
    require(value <= _balances[from]);
    require(value <= _allowed[from][msg.sender]);
    require(to != address(0));

    _balances[from] = _balances[from].sub(value);

    uint256 tokensToBurn = 0;
    uint256 tokensToTransfer = value.sub(tokensToBurn);

    _balances[to] = _balances[to].add(tokensToTransfer);
    _totalSupply = _totalSupply.sub(tokensToBurn);

    _allowed[from][msg.sender] = _allowed[from][msg.sender].sub(value);

    emit Transfer(from, to, tokensToTransfer);
    emit Transfer(from, address(0), tokensToBurn);

    return true;
  }

  function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
    require(spender != address(0));
    _allowed[msg.sender][spender] = (_allowed[msg.sender][spender].add(addedValue));
    emit Approval(msg.sender, spender, _allowed[msg.sender][spender]);
    return true;
  }

  function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
    require(spender != address(0));
    _allowed[msg.sender][spender] = (_allowed[msg.sender][spender].sub(subtractedValue));
    emit Approval(msg.sender, spender, _allowed[msg.sender][spender]);
    return true;
  }

/*  1-time token mint/creation function. Tokens are only minted during contract creation, and cannot be done again.*/
  function _mint(address account, uint256 amount) internal {
    require(amount != 0);
    _balances[account] = _balances[account].add(amount);
    emit Transfer(address(0), account, amount);
  }

  function burn(uint256 amount) external {
    _burn(msg.sender, amount);
  }

  function _burn(address account, uint256 amount) internal {
    require(amount != 0);
    require(amount <= _balances[account]);
    _totalSupply = _totalSupply.sub(amount);
    _balances[account] = _balances[account].sub(amount);
    emit Transfer(account, address(0), amount);
  }

  function burnFrom(address account, uint256 amount) external {
    require(amount <= _allowed[account][msg.sender]);
    _allowed[account][msg.sender] = _allowed[account][msg.sender].sub(amount);
    _burn(account, amount);
  }
}
function _mint(address account, uint256 amount) internal {
    require(amount != 0);
    _balances[account] = _balances[account].add(amount);
    emit Transfer(address(0), account, amount);
  }
/*  1-time token mint/creation function. Tokens are only minted during contract creation, and cannot be done again.*/