import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
sys.setrecursionlimit(10**7)
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################

n,k = na()
a = sorted(na())[::-1]
ans = 0
for i in range(1<<(n-1)):
    x = k
    for j in range(n):
        if i>>j&1:
            x %= a[j]
    x %= a[-1]
    ans = max(ans, x)
print(ans)