from itertools import product
n,k=map(int,input().split())
a=list(map(int,input().split()))
a.sort(reverse=True)
ans=0
for bit in product(range(2),repeat=n-1):
    tmp=k
    for i in range(n-1):
        if bit[i]:
            tmp%=a[i]
    tmp%=a[-1]
    ans=max(ans,tmp)
print(ans)