class program
    {
    define turnright()
        {
        iterate(3)
            { turnleft(); }
        }
    
    define saltaLinea()
        {
        turnleft();
    
        while( frontIsClear && rightIsBlocked )
            move();
    
        if( rightIsClear )
            {
            turnright();
            move();
            }
        else
            {
            turnleft();
            turnleft();
            while( frontIsClear && leftIsBlocked )
                move();
            turnleft();
            move();
            }
        }
    
    program()
        {
        while( notNextToABeeper )
            {
            if( frontIsClear )
                move();
            else
                saltaLinea();
            }
        turnoff();
        }
    }