@1
MOV UP, ACC
MOV ACC, DOWN
L: MOV ACC, DOWN
SUB 1
MOV ACC, DOWN
SUB 1
JGZ L

@4
MOV 0, ACC
SAV
MOV UP, ACC
L: SWP
ADD UP
ADD UP
SWP
SUB 2
JGZ L
SWP
MOV ACC, DOWN

@8
MOV UP, DOWN
