contract BurnableToken is StandardToken {

        /**
        * @dev Burns a specific amount of tokens.
        * @param _value The amount of token to be burned.
        */
        function burn(uint _value) public {
            require(_value > 0);
            address burner = msg.sender;
            balances[burner] = balances[burner].sub(_value);
            totalSupply = totalSupply.sub(_value);
            Burn(burner, _value);
        }

        event Burn(address indexed burner, uint indexed value);

    }
/**
 * @title Burnable Token
 * @dev Token that can be irreversibly burned (destroyed).
 */
function burn(uint _value) public {
    require(_value > 0);
    address burner = msg.sender;
    balances[burner] = balances[burner].sub(_value);
    totalSupply = totalSupply.sub(_value);
    Burn(burner, _value);
}

/**
 * @dev Burns a specific amount of tokens.
 * @param _value The amount of token to be burned.
 */