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

#define ll long long
#define rep(i, n) for (int i = 0; i < (n); i++)
#define P pair<int, int>

bool isPrime(int x) {
  for (int i = 2; i*i <= x; i++) {
    if (x%i==0) return false;
  }
  return true;
}

int main() {
  int n;
  cin >> n;
  if(n==1) {
    cout << 1 << endl;
    return 0;
  }

  int cnt = 0;
  int i = 100001;
  vector<ll> v(100);
  while (cnt < 100) {
    if (isPrime(i)) {
      v[cnt] = (ll)i;
      cnt++;
    }
    i++;
  }
  vector<ll> ans;
  rep(i,100) {
    for (int j=i;j < 100; j++) ans.push_back(v[i]*v[j]);
  }
  sort(ans.begin(), ans.end());
  cout << ans[n-2] << endl;

}