class program {
	
	void whileMove()
    {
    	while(frontIsClear)
        	move();
	}
    
    void turn(n)
    {
    	iterate(n)
        	turnleft();
	}
    
    void getHeight()
    {
    	if(frontIsClear)
        {
        	turn(1);
        	whileMove();
            while(nextToABeeper)
            	pickbeeper();
            turn(2);
            whileMove();
            turn(1);
        	move();
            getHeight();
            putbeeper();
        }
	}
    
    void checkPos()
    {
    	if(nextToABeeper)
        {
            pickbeeper();
            turn(2);
            whileMove();
            turn(1);
            getHeight();
        }
	}
    
    void findTop()
    {
    	turn(1);
        while(frontIsClear)
        {
        	checkPos();
            if(frontIsClear)
              move();
            else
                turnoff();
		}
        checkPos();
        turn(2);
        whileMove();
        turn(1);
        move();
        findTop();
	}
    
    program () {
    	while(nextToABeeper)
        	pickbeeper();
        whileMove();
        turn(2);
        findTop();
        turnoff();
    }
}