.text
249: #-1
250: #0
251: #1

.data
128: a
129: b
130: res
131: cnt

.code
	LDA #0
	STA res
	LDA b
	STA cnt
in:
	JZ out
	LDA res
	ADD a
	STA res
	LDA cnt
	ADD #-1
	STA cnt
	JMP in
out:
	HLT