#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 ans = 0;
  for (int i = 0; i < n; ++i) {
    int a = va[i], md = k % a;
    int min_a = -1;
    for (int j = 0; j < n; ++j) {
      if (i == j) {
        continue;
      }

      if (min_a < 0 || va[j] < min_a) {
        min_a = va[j];
      }
    }

    if (md < min_a) {
      ans = max(ans, md);
    }
  }

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