#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(int)(n);i++)
using namespace std;
using ll = long long ;
using P = pair<int,int> ;
using pll = pair<long long,long long>;
constexpr int INF = 1e9;
constexpr long long LINF = 1e17;
constexpr int MOD = 1000000007;
constexpr double PI = 3.14159265358979323846;

int main(){
    int n,k;
    cin >> n >> k;
    vector<int> a(n);
    rep(i,n) cin >> a[i];
    sort(a.begin(),a.end());
    vector<set<int>> dp((1<<n),set<int>());
    dp[0].insert(k);

    for(int bit=0;bit<((1<<n)-1);bit++){
        for(int s:dp[bit]){
            rep(i,n){
                if(!(bit & 1<<i)){
                    dp[bit|(1<<n)-(1<<i)].insert(s%a[i]);
                }
            }
        }
    }

    /*
    rep(i,1<<n){
        for(int s:dp[i]) cout << s << " " ;
        cout << endl;
    }
    */

    cout << *(dp[(1<<n)-1].rbegin()) << endl;
    return 0;
}