@1
MOV UP, RIGHT

@2
MOV LEFT, ACC
SAV
MOV UP, ACC
JEZ Z
L: SWP
MOV ACC, DOWN
SWP
SUB 1
JGZ L
Z: MOV -999, DOWN

@5
MOV UP, DOWN

@7
L: ADD UP
JLZ D
JMP L
D: ADD 999
MOV ACC, DOWN
MOV 0, ACC
