class program
{
    define avanzar()
    {
        if( frontIsClear )
        {
            move();
        }
        else
        {
            if( leftIsClear )
            {
                turnleft();
                move();
            }
            else
            {
                turnleft();
                turnleft();
                turnleft();
                move();
            }
        }
    }

    program()
    {
        while( frontIsClear || leftIsClear || rightIsClear )
            avanzar();
        putbeeper();
        turnoff();
    }

}