L = int(input())
N = int(input())
W_LIST = list(map(int, input().split()))
W_LIST.sort()
w = 0
a = 0
for i in range(N):
    if (w + W_LIST[i]) > L:
        print(a)
        break
    elif (w + W_LIST[i]) == L:
        a+=1
        print(a)
        break
    elif i+1 == N:
        a+=1
        print(a)
    else:
        w+=W_LIST[i]
        a+=1