@0
S: MOV UP, ACC
L: SAV
MOV RIGHT, ACC
JEZ S
SWP
MOV ACC, RIGHT
MOV ACC, RIGHT
JMP L

@1
MOV UP, ACC
MOV ACC, LEFT
MOV ACC, RIGHT
JEZ Z
SUB LEFT
JGZ A
MOV 0, ACC
A: ADD LEFT
SUB RIGHT
JLZ B
MOV 0, ACC
B: ADD RIGHT
Z: MOV ACC, DOWN

@2
S: MOV UP, ACC
L: SAV
MOV LEFT, ACC
JEZ S
SWP
MOV ACC, LEFT
MOV ACC, LEFT
JMP L

@4
MOV UP, DOWN

@8
MOV UP, DOWN
