#include<cstdio>
#include<cstring>
#include<iostream>
#include<cmath>
#include<ctime>
#include<string>
#include<algorithm>
#include<vector>
#include<queue>
#include<stack>
#include<map>
using namespace std;
typedef long long LL;
const int MR=100;
int n,K,ans;
int a[MR];
void dfs(int p,int r){//决定a[p]要不要模
    if(r<ans) return;
    if(p==n){
        ans=max(ans,r%a[n]);//第n个是最小的a，必须模
        return;
    }
    dfs(p+1,r);
    dfs(p+1,r%a[p]);
}
int main(){
    cin>>n>>K;
    for(int i=1;i<=n;i++){
        cin>>a[i];
    }
    sort(a+1,a+1+n);
    reverse(a+1,a+1+n);
    dfs(1,K);
    cout<<ans<<endl;
    return 0;
}