n,k=map(int,input().split())
arr=list(map(int,input().split()))
arr=sorted(arr,reverse=True)
ans=0
for i in range(2**(n-1)):
    tmp=k
    for j in range(n):
        if i&(1<<j):
            tmp%=arr[j]
    tmp%=arr[-1]
    ans=max(ans,tmp)
print(ans)