;; This program reads in a positive integer n and prints out the sum
;;     1 + 2 + 3 + ... + n.
;; It implements this python program:
;;
;; n = int(input())
;; sum = 0
;; i = 1
;; while i <= n:
;;     sum += i
;; print(sum)

	allocate-registers n sum i test print one loop

	li one 1
	li print printL
	li loop loopL

	read n
	li sum 0
	li i 1

loopL:
	sle test i n
	jeqz test print
	add sum sum i
	add i i one
	j loop
printL:
	write sum
	halt