from itertools import product
N, K = map(int, input().split())
A = list(map(int, input().split()))

if N == 1:
    exit(print(K%A[0]))

A.sort(reverse=True)

ans = 0
for pat in product([0, 1], repeat=N - 1):
    num = K
    for i in range(N - 1):
        if pat[i] == 1:
            num %= A[i]
    # 最後は常に選択
    num %= A[-1]

    if num > ans:
        ans = num

print(ans)