N, S = map(int, input().split())
A = list(map(int, input().split()))
A.sort(reverse=True)

# t秒でファン達を満足させられるか
L, R = 1, S
while L < R:
    t = (L + R) // 2
    size = 0
    i = 0
    while A[i] > t:
        size += A[i]
        if i + t < N:
            i += t
        else:
            break
    if size <= S - 1:
        R = t
    else:
        L = t + 1

# L == R のはずなので
print(L)