@1
MOV UP, RIGHT

@2
S: MOV UP, ACC
JEZ Z
JLZ N
MOV LEFT, NIL
MOV RIGHT, DOWN
JMP S
N: MOV LEFT, DOWN
MOV RIGHT, NIL
JMP S
Z: MOV LEFT, ACC
ADD RIGHT
MOV ACC, DOWN

@3
MOV UP, LEFT

@6
MOV UP, DOWN

@9
MOV UP, DOWN
