#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("avx,avx2")
#include <bits/stdc++.h>
#define INF 1000000001LL
#define LNF 1000000000000000001LL
#define MOD 1000000007LL
#define MAX 502
#define long long long
#define all(x) x.begin(),x.end()
using namespace std;

int main()
{
	ios_base::sync_with_stdio(0); 
    cin.tie(0);

    int n,k;
    cin >> n >> k;

    vector<long> arr(n);
    for(int i = 0; i<n; i++)
        cin >> arr[i];
    sort(all(arr));
    reverse(all(arr));

    long mx = k%arr.back();

    for(int i = 0; i<(1<<(n-1)); i++)
    {
        long p = k;
        for(int j = 0; j<n-1; j++)
        {
            if(i&(1<<j))
                p%=arr[j];
        }
        mx = max(mx,p%arr.back());
    }
    cout << mx << endl;

    return 0;
}