L = int(input())
N = int(input())
W = [int(_) for _ in input().split()]
W.sort()
s = 0
cnt = 0
for n in W:
    tmp = s + n
    if L > tmp:
        s = tmp
        cnt += 1
    elif L == tmp:
        s = tmp
        cnt += 1
        break
    else:
        break

print(cnt)