L, N = int(input()), int(input())
W_list = list(map(int, input().split()))
W_list = sorted(W_list)
if L >= sum(W_list):
    print(N)
    exit()

sumsum = 0
for i in range(N):
    if sumsum + W_list[i] < L:
        sumsum += W_list[i]
        continue
    elif sumsum + W_list[i] == L:
        print(i + 1)
        exit()
    else:
        print(i if i != 0 else '0')
        exit()