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#include <bits/stdc++.h>
#define MP make_pair
#define PB push_back
#define int long long
#define st first
#define nd second
#define rd third
#define FOR(i, a, b) for(int i =(a); i <=(b); ++i)
#define RE(i, n) FOR(i, 1, n)
#define FORD(i, a, b) for(int i = (a); i >= (b); --i)
#define REP(i, n) for(int i = 0;i <(n); ++i)
#define VAR(v, i) __typeof(i) v=(i)
#define FORE(i, c) for(VAR(i, (c).begin()); i != (c).end(); ++i)
#define ALL(x) (x).begin(), (x).end()
#define SZ(x) ((int)(x).size())
using namespace std;
template<typename TH> void _dbg(const char* sdbg, TH h) { cerr<<sdbg<<"="<<h<<"\n"; }
template<typename TH, typename... TA> void _dbg(const char* sdbg, TH h, TA... t) {
  while(*sdbg != ',')cerr<<*sdbg++; cerr<<"="<<h<<","; _dbg(sdbg+1, t...);
}
#ifdef LOCAL
#define debug(...) _dbg(#__VA_ARGS__, __VA_ARGS__)
#define debugv(x) {{cerr <<#x <<" = "; FORE(itt, (x)) cerr <<*itt <<", "; cerr <<"\n"; }}
#else
#define debug(...) (__VA_ARGS__)
#define debugv(x)
#define cerr if(0)cout
#endif
#define next ____next
#define prev ____prev
#define left ____left
#define hash ____hash
typedef long long ll;
typedef long double LD;
typedef pair<int, int> PII;
typedef pair<ll, ll> PLL;
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<ll> VLL;
typedef vector<pair<int, int> > VPII;
typedef vector<pair<ll, ll> > VPLL;

template<class C> void mini(C&a4, C b4){a4=min(a4, b4); }
template<class C> void maxi(C&a4, C b4){a4=max(a4, b4); }
template<class T1, class T2>
ostream& operator<< (ostream &out, pair<T1, T2> pair) { return out << "(" << pair.first << ", " << pair.second << ")";}
template<class A, class B, class C> struct Triple { A first; B second; C third;
  bool operator<(const Triple& t) const { if (st != t.st) return st < t.st; if (nd != t.nd) return nd < t.nd; return rd < t.rd; } };
template<class T> void ResizeVec(T&, vector<int>) {}
template<class T> void ResizeVec(vector<T>& vec, vector<int> sz) {
  vec.resize(sz[0]); sz.erase(sz.begin()); if (sz.empty()) { return; }
  for (T& v : vec) { ResizeVec(v, sz); }
}
typedef Triple<int, int, int> TIII;
template<class A, class B, class C>
ostream& operator<< (ostream &out, Triple<A, B, C> t) { return out << "(" << t.st << ", " << t.nd << ", " << t.rd << ")"; }
template<class T> ostream& operator<<(ostream& out, vector<T> vec) { out<<"("; for (auto& v: vec) out<<v<<", "; return out<<")"; }

set<int> small_gen;
int k, N;
int cnt_sm, cnt_big;
VI cur_ps;
const int maxN = 5e5;
int32_t biggest_up_to[maxN + 5];
int res;
bool processing_big;
void Bt(int cur_prod, int cur_pos) {
  assert(cur_prod <= N);
  if (cur_prod > N) { return; }
  if (cur_prod * (N / cur_prod) <= res) { return; }
  if (cur_pos == SZ(cur_ps)) {
    if (processing_big) {
      if (N / cur_prod < maxN) {
        maxi(res, cur_prod * biggest_up_to[N / cur_prod]);
        //cnt_sm++;
      } else {
        int ratio = N / cur_prod;
        auto it = small_gen.upper_bound(ratio);
        assert(it != small_gen.begin());
        it--;
        maxi(res, cur_prod * (*it)); 
        //cnt_big++;
      }
    } else {
      small_gen.insert(cur_prod);
      if (cur_prod <= maxN) {
        biggest_up_to[cur_prod] = cur_prod;
      }
    }
    return;
  }
  while (1) {
    Bt(cur_prod, cur_pos + 1);
    if (N / cur_ps[cur_pos] >= cur_prod) {
      cur_prod *= cur_ps[cur_pos];
    } else {
      return;
    }
  }
}
  
  
VI small, big;
    
int32_t main() {

  ios_base::sync_with_stdio(0);
  cout << fixed << setprecision(10);
  cerr << fixed << setprecision(10);
  cin.tie(0);
  //double beg_clock = 1.0 * clock() / CLOCKS_PER_SEC;
  
  res = 1;
  cin>>k>>N;
  VI ps;
  RE (i, k) {
    int p;
    cin>>p;
    ps.PB(p);
  }
  sort(ALL(ps));
// #ifdef LOCAL
//   int check_manually = 1e5;
// #else 
//   int check_manually = 1e5;
// #endif
//   FORD (i, N, max(1ll, N - check_manually + 1)) {
//     int tmp = i;
//     for (auto p : ps) {
//       while (tmp % p == 0) {
//         tmp /= p;
//       }
//     }
//     if (tmp == 1) {
//       cout<<i<<endl;
//       return 0;
//     }
//   }
//   N -= check_manually;
  //small_gen.reserve((int)2.6e5);
  int gen = min(4ll, SZ(ps));
  REP (i, SZ(ps)) {
    if (i < gen) {
      small.PB(ps[i]);
    } else {
      big.PB(ps[i]);
    }
  }
  cur_ps = small;
  Bt(1, 0);
  RE (i, maxN) {
    biggest_up_to[i] = max(biggest_up_to[i], biggest_up_to[i - 1]);
  }
//   debug(res);
//   cnt_sm = 0;
//   cnt_big = 0;
  reverse(ALL(big));
//   res = 0;
  cur_ps = big;
  processing_big = true;
  Bt(1, 0);
  //debug(res, cnt_sm, cnt_big);
  cout<<res<<endl;
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  return 0;
}