total = 0
ans = 0
L = int(input())
N = input()
W = list(map(int, input().split()))
W.sort()
for i in W:
    total += i
    ans +=1
    if L < total:
        print(ans - 1)
        break
if ans == 1:
    print(ans)
else:
    print(ans - 1)