L = int(input())
N = int(input())
W = list(map(int, input().split()))

if L < min(W):
    print(0)
elif L >= sum(W):
    print(N)
else:
    W.sort()
    for i in range(N):
        s = sum(W[:i+1])
        if L == s:
            print(i+1)
            break
        elif L < s:
            print(i)
            break