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

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

print(ans)