@1
L: MOV UP, ACC
JEZ Z
MOV 999, DOWN
JMP L
Z: MOV -1, DOWN

@4
ADD UP
JLZ Z
SUB ACC
Z: MOV ACC, DOWN

@8
MOV UP, ACC
ADD 2
MOV ACC, RIGHT

@9
L: MOV LEFT, ACC
JLZ O
MOV 0, DOWN
JMP L
O: MOV 1, DOWN
