@1
START:
MOV RIGHT, ACC
JGZ ZERO
MOV UP, DOWN
JMP START
ZERO:
MOV 0, DOWN
MOV UP, NIL

@2
MOV UP, ACC
MOV ACC, LEFT
MOV ACC, RIGHT

@3
START:
MOV LEFT, ACC
JLZ ZERO
MOV UP, DOWN
JMP START
ZERO:
MOV 0, DOWN
MOV UP, NIL

@5
MOV UP, RIGHT

@6
MOV LEFT, ACC
ADD RIGHT
MOV ACC, DOWN

@7
MOV UP, LEFT

@9
MOV UP, DOWN
