import itertools
N,K = map(int, input().split())
A = [int(a) for a in input().split()]

s = min(A)
cnt = A.count(s)
ans = 0
for i in range(1, N+1):
    for C in itertools.combinations(A, i):
        num = K
        C = list(C)
        C.sort(reverse=True)
        for c in C:
            num %= c
        for _ in range(cnt-C.count(s)):
            num %= s
        ans = max(ans, num)

print(ans)