#include <bits/stdc++.h>

using namespace std;

int main(int argc, const char *argv[]) {
  int n, k;
  cin >> n >> k;

  vector<int> va(n);
  for (int i = 0; i < n; ++i) {
    cin >> va[i];
  }

  int min_a = *min_element(va.begin(), va.end());
  int ans = 0;
  for (auto a : va) {
    int md = k % a;
    if (md < min_a) {
      ans = max(ans, md);
    }
  }

  cout << ans << '\n';
}