@1
MOV UP, RIGHT

@2
L: MOV UP, ACC
JEZ Z
JGZ B
MOV LEFT, DOWN
MOV RIGHT, NIL
JMP L
B: MOV LEFT, NIL
MOV RIGHT, DOWN
JMP L
Z: ADD LEFT
ADD RIGHT
MOV ACC, DOWN

@3
MOV UP, LEFT

@6
MOV UP, DOWN

@9
MOV UP, DOWN
