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

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

  ll N, K;
  cin >> N >> K;

  vector<ll> A(N);
  for(auto &i : A) { cin >> i; }
  ranges::sort(A, ranges::greater());

  ll ans = 0;
  for(ll i = 1; i < 1 << N; i++) {
    ll k = K;
    for(ll j = 0; j < N - 1; j++) {
      if(i >> j & 1) { k %= A[j]; }
    }
    k %= A.back();
    ans = max(ans, k);
  }

  cout << ans << "\n";
}