L = int(input())
N = int(input())
a = [int(x) for x in input().split()]
b = sorted(a)
temp = 0
c = 0
for i in range(N):
    temp += b[i]
    if temp == L:
        print(i + 1)
        c = 1
        break
    elif temp > L:
        print(i)
        c = 1
        break
if c == 0:
    print(N)