#include <bits/stdc++.h>
#define rep(i, a, n) for (int i = a; i < n; i++)
#define repr(i, a, n) for (int i = n - 1; i >= a; i--)
using namespace std;
using ll = long long;
using P = pair<int, int>;
template <typename T> void chmin(T &a, T b) { a = min(a, b); }
template <typename T> void chmax(T &a, T b) { a = max(a, b); }

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

  int n, k;
  cin >> n >> k;
  vector<int> a(n);
  rep(i, 0, n) cin >> a[i];

  int ans = 0;
  rep(i, 0, n) {
    int t = k % a[i];
    rep(j, 0, n) {
      if (a[j] < t) {
        t %= a[j];
      }
    }
    if (t != k % a[i])
      chmax(ans, t);
  }

  int minv = *min_element(a.begin(), a.end());
  rep(i, 0, n) {
    int x = k % a[i];
    if (x < minv)
      chmax(ans, x);
  }

  cout << ans << endl;
}