#coding:utf-8

from heapq import heapify,heappop

L=input()
N=input()
W_str=raw_input().split()
W=[int(i) for i in W_str]

heapify(W)

cnt=0
while True:
	L-=heappop(W)
	if L < 0:
		break
	cnt+=1
	
print cnt