# coding: utf-8

#d, p = map(int,input().split())
l = int(input())
N = int(input())
W = list(map(int,input().split()))

W.sort()
ans = 0
for i in range(N):
    l -= W[i]
    if l > 0:
        ans += 1
    else:
        break
print(ans)