mov ebx,12
cmp ebx,0
jge fibo_start
mov eax,0
jmp end

fibo_start:
	cmp ebx,0
	jne not_zero
	mov eax,0
	ret
	not_zero:
	cmp ebx,1
	jne fibo_rec
	mov eax,1
	ret

fibo_rec:
	sub ebx,1
	push ebx
	call fibo_start
	pop ebx
	mov edx,eax
	sub ebx,1
	push edx
	call fibo_start
	pop edx
	add eax,edx
	ret
end: