N, M = list(map(int, input().split()))
C = list(map(int, input().split()))
zero_count = 0
C.sort()
res = 0
res_i = -1
for i, ci in enumerate(C):
    res += ci
    if res > M:
        res_i = i
        break
    if res == M:
        res_i = i + 1
        break
print(res_i)