N, K = map(int, input().split())
A = list(map(int, input().split()))
A.sort(reverse=True)
ans = 0

for S in range(1, 1<<N):
    now = K
    right = -1
    
    for i in range(N):
        if (S>>i)&1:
            now %= A[i]
            right = i
    
    for i in range(right+1, N):
        now %= A[i]
    
    ans = max(ans, now)

print(ans)