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

signed main(){

  int64_t n,k;
  cin>>n>>k;
  vector<int64_t> a(n);
  for(auto& ai:a)cin>>ai;
  sort(rbegin(a),rend(a));

  auto chmax = [](auto& a,auto b){if(a<b)a=b;};

  int64_t ans = 0;
  for(int b=0;b<(1<<n);++b){
    int64_t x = k;
    for(int i=0;i<n;++i)if(b>>i&1){
      x %= a[i];
    }
    x %= a.back();
    chmax(ans,x);
  }
  cout<<(ans)<<endl;

}