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

#define all(x) begin(x), end(x)
#ifdef CKISEKI
#define safe cerr << __PRETTY_FUNCTION__ << " line " << __LINE__ << " safe\n"
#define debug(a...) debug_(#a, a)
#define orange(a...) orange_(#a, a)
void debug_(auto s, auto ...a) {
  cerr << "\e[1;32m(" << s << ") = (";
  int f = 0;
  (..., (cerr << (f++ ? ", " : "") << a));
  cerr << ")\e[0m\n";
}
#include <experimental/iterator>
void orange_(auto s, auto L, auto R) {
  cerr << "\e[1;33m[ " << s << " ] = [ ";
  using namespace experimental;
  copy(L, R, make_ostream_joiner(cerr, ", "));
  cerr << " ]\e[0m\n";
}
#else
#define safe ((void)0)
#define debug(...) safe
#define orange(...) safe
#endif

int main() {
  cin.tie(nullptr)->sync_with_stdio(false);

  const int maxn = 100;
  vector<int> sieve(maxn), prs;
  for (int i = 2; i < maxn; i++)
    if (!sieve[i]) 
      for (int j = i * 2; j < maxn; j += i)
        sieve[j] = true;
  for (int i = 2; i < maxn; i++)
    if (!sieve[i]) 
      prs.push_back(i);

  int k;
  int64_t N;
  vector<int> has(maxn);
  // for (int p : prs)
  //   has[p] = true;

  cin >> k;
  cin >> N;
  for (int i = 0; i < k; i++) {
    int p;
    cin >> p;
    has[p] = true;
  }

  orange(all(prs));

  const int C = 1e8;
  vector<int> ns;
  ns.reserve(930000);

  auto dfs = [&](auto self, size_t i, size_t r, int64_t prod) {
    if (i >= r) {
      ns.push_back(prod);
      return;
    }
    self(self, i + 1, r, prod);
    if (has[prs[i]])
      while ((__int128)prod * prs[i] <= C) {
        prod *= prs[i];
        self(self, i + 1, r, prod);
      }
  };

  dfs(dfs, 0, prs.size(), 1);
  debug(ns.size());

  std::make_heap(all(ns));
  for (size_t i = ns.size(); i > 0; i--)
    std::pop_heap(ns.begin(), ns.begin() + i);


  // sort(all(ns));

  const int64_t C2 = 3e10;

  int cnt = 0;
  int64_t ans = 1;
  auto dfs2 = [&](auto self, size_t i, size_t r, int64_t prod) {
    auto it = upper_bound(all(ns), N / prod);
    if (it != ns.begin()) {
      ans = max(ans, *prev(it) * prod);
    }

    if (i >= r) {
      return;
    }

    // ++cnt;
    // if (cnt % 10000 == 0) cerr << cnt << endl;

    for (size_t j = i; j < r; j++) {
      if (has[prs[j]]) {
        auto p = prod;
        while ((__int128)p * prs[j] <= C2) {
          p *= prs[j];
          self(self, j + 1, r, p);
        }
      }
    }
  };

  dfs2(dfs2, 0, prs.size(), 1);
  cout << ans << '\n';

  return 0;
}