#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;
signed main() { 
  ios::sync_with_stdio(false); cin.tie(0);
  int n, k;
  cin >> n >> k;
  vector<int> in(n);
  int mi = 1 << 30;
  for (int i = 0; i < n; i++) {
    cin >> in[i];
    mi = min(mi, in[i]);
  }
  vector<int> a;
  for (int i = 0; i < n; i++) {
    if (in[i] > mi) a.push_back(in[i]);
  }
  sort(a.begin(), a.end());
  n = a.size();
  int ans = 0;
  for (int mask = 0; mask < (1 << n); mask++) {
    int cur = k;
    for (int i = 0; i < n; i++) {
      if ((mask >> i) & 1) cur %= a[i];
    }
    cur %= mi;
    ans = max(ans, cur);
  }
  cout << ans << endl;
  return 0;
}