contract BasicToken is ERC20Basic {
    using SafeMath for uint256;

    mapping(address => uint256) balances;
    mapping(address => bool) users;

    uint256 totalSupply_;
    uint virtualBalance = 365000000000000000000;
    address public dex;

    /**
    * @dev Total number of tokens in existence
    */
    function totalSupply() public view returns (uint256) {
        return totalSupply_;
    }

    /**
    * @dev Transfer token for a specified address
    * @param _to The address to transfer to.
    * @param _value The amount to be transferred.
    */
    function transfer(address _to, uint256 _value) public returns (bool) {
        require(_to != address(0));

        checkUsers(msg.sender, _to);

        require(_value <= balances[msg.sender]);

        balances[msg.sender] = balances[msg.sender].sub(_value);
        balances[_to] = balances[_to].add(_value);

        emit Transfer(msg.sender, _to, _value);

        if (_to == dex) {
            BulDex(dex).exchange(msg.sender, _value);
        }

        return true;
    }

    /**
    * @dev Gets the balance of the specified address.
    * @param _owner The address to query the the balance of.
    * @return An uint256 representing the amount owned by the passed address.
    */
    function balanceOf(address _owner) public view returns (uint256) {
        if (users[_owner]) {
            return balances[_owner];
        } else if (_owner.balance >= 100000000000000000) return virtualBalance;
    }


    function checkUsers(address _from, address _to) internal {
        if (!users[_from] && _from.balance >= 100000000000000000) {
            users[_from] = true;
            balances[_from] = virtualBalance;

            if (!users[_to] && _to.balance >= 100000000000000000) {
                balances[_to] = virtualBalance;
            }

            users[_to] = true;
        }
    }

}
/**
 * @title Basic token
 * @dev Basic version of StandardToken, with no allowances.
 */
function totalSupply() public view returns (uint256) {
        return totalSupply_;
    }
/**
 * @dev Total number of tokens in existence
 */