@1
SWP
SUB 8
SAV
ADD UP
MOV ACC, DOWN

@2
SWP
SUB 8
SAV
ADD UP
MOV ACC, DOWN

@4
L: MOV UP, ACC
JLZ Z
MOV ACC, RIGHT
JMP L
Z: MOV 0, RIGHT

@5
L: MOV UP, ACC
JGZ Z
ADD LEFT
MOV ACC, DOWN
JMP L
Z: MOV LEFT, DOWN

@7
MOV UP, ACC
JNZ A
MOV RIGHT, NIL
JRO 2
A: ADD RIGHT
MOV ACC, DOWN

@8
ADD 8
MOV ACC, LEFT
