L = int(input())
N = int(input())
W = [int(_) for _ in input().split()]

sum = 0
cnt = 0
W.sort()

for i in range(N):
    if sum + W[i] < L:
        sum += W[i]
        cnt += 1
    elif sum + W[i] == L:
        cnt += 1
        break
    else:
        break

print(cnt)