#include <bits/stdc++.h>
using namespace std;

#ifdef LOCAL
#include "debug.h"
#else
#define DEBUG(...)
#endif

int main() {
  cin.tie(nullptr);
  ios::sync_with_stdio(false);
  int n, k;
  cin >> n >> k;
  vector<int> a(n);
  for (auto&& e : a) cin >> e;
  sort(rbegin(a), rend(a));
  int res = 0;
  for (int bt = 1; bt < 1 << n; ++bt) {
    int cur = k;
    for (int i = 0; i < n; ++i) {
      if (bt >> i & 1) {
        cur %= a[i];
      }
    }
    cur %= a.back();
    res = max(res, cur);
  }
  cout << res << '\n';
}