add.kp

   define-new-instruction about-face as
   begin
      turnleft;
      turnleft;
   end;

   define-new-instruction face-north as
   begin
      while not-facing-north do
         turnleft;
   end;

   define-new-instruction face-south as
   begin
      while not-facing-south do
         turnleft;
   end;

   define-new-instruction face-east as
   begin
      while not-facing-east do
         turnleft;
   end;

   define-new-instruction face-west as
   begin
      while not-facing-west do
         turnleft;
   end;

   define-new-instruction go-to-wall as
   begin
      while front-is-clear do
         move;
   end;

   define-new-instruction move-1-block-north as
   begin
      move;
   end;

   define-new-instruction move-1-block-south as
   begin
      move;
   end;

   define-new-instruction move-1-block-east as
   begin
      move;
   end;

   define-new-instruction move-1-block-west as
   begin
      move;
   end;

   define-new-instruction go-to-next-diagonal as
   begin
      if facing-west then
         face-north
      else face-east;
      move;
      about-face;
   end;

   define-new-instruction zag-down-right as
   begin
      move-1-block-south;
      face-east;
      move-1-block-east;
      face-south;
   end;

   define-new-instruction zig-left-up as
   begin
      move-1-block-west;
      face-north;
      move-1-block-north;
      face-west;
   end;

   define-new-instruction zag-move as
   begin
      if front-is-clear then
         zag-down-right
      else go-to-next-diagonal;
   end;

   define-new-instruction zig-move as
   begin
      if front-is-clear then
         zig-left-up
      else go-to-next-diagonal;
   end;

   define-new-instruction go-to-origin as
   begin
      face-west;
      go-to-wall;
      face-south;
      go-to-wall;
   end;

   define-new-instruction find-beeper as
   begin
      go-to-origin;
      face-west;
      while not-next-to-a-beeper do
      begin
         if facing-west then
            zig-move
         else zag-move;
      end;
   end;

   define-new-instruction compute-sum as
   begin
      while front-is-clear do
         zag-down-right;
      go-to-next-diagonal;
   end;

   beginning-of-execution
      find-beeper;
      compute-sum;
      putbeeper;
      face-east;
      move;
      about-face;
      turnoff;
   end-of-execution

end-of-program