class program {
define turnright()
{
    iterate(3)
     turnleft();
}
define halfturn()
{
   turnleft();
   turnleft();
}
define izq1()
{
   if(frontIsClear)
    {
       move();
       while(leftIsClear)
       {
          turnleft();
          move();
       }
       mov1();
    }
    else
    {
     turnright();
      izq1();
    }
}
define mov1()
{
   if(nextToABeeper)
    {
     pickbeeper();
     if(notNextToABeeper)
      {
        putbeeper();
        izq1();
      }
    }
   else
    {
       putbeeper();
       izq1();
    }
}
define pared()
{
  turnright();
  while(frontIsClear)
   move();
  if( notNextToABeeper )
   ini();
  halfturn();
  while(frontIsClear)
   move();
   turnright();
}
define izq2()
{
   if(frontIsClear)
    {
       move();
       while(leftIsClear)
       {
          turnleft();
          move();
       }
       mov2();
    }
    else
    {
     turnright();
      mov2();
    }
}
define mov2()
{
   pared();
   izq2();
}

define ini()
{
   while(leftIsClear)
     turnleft();
   while(frontIsClear || notFacingWest)
    {
       if(frontIsBlocked)
        turnright();
       else
       move();
    }
   turnoff();
}

program() {
    while(leftIsClear)
     turnleft();
     putbeeper();
     putbeeper();
     izq1();
     mov2();

    turnoff();
}

}