# -*- coding: utf-8 -*-

def main():
	L = int(input())
	N = int(input())
	numbers = [int(box) for box in input().split()]

	numbers.sort()

	La = L
	num = 0

	for i in numbers:
		La = La - i
		if La > 0:
			num = num + 1

	print(num)


if __name__ == "__main__":
	main()