n,k = map(int,input().split())
a = list(map(int,input().split()))
a.sort()
nax = 0


from collections import deque
import bisect
for i in range(n):
    u = a[:i]
    crt = k % a[i]
    # print(a[i], crt)
    for j in range(n):
        if crt < a[j]:
            u = a[:j]
            break
    # print(u)
    q = deque([])
    q.append((crt, u))
    while q:
        now = q.popleft()
        if not now[1]:
            nax = max(nax, now[0])
        else:
            for j in range(len(now[1])):
                crt = now[0] % now[1][j]
                t = bisect.bisect_right(now[1], crt)
                q.append((crt, now[1][:t]))
    #     print(q)
    # print(nax)
print(nax)