#include <bits/stdc++.h>

using namespace std;

template <typename T>
bool is_prime(T n) {
  if (n == 0 || n == 1) return false;
  if (n == 2) return true;
  if (n % 2 == 0) return false;
  for (T i = 3; i * i < n + 1; i += 2) {
    if (n % i == 0) return false;
  }
  return true;
}

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  int N;
  cin >> N;
  vector<int64_t> X;
  for (int64_t x = 100001; x < 200000 && (int)X.size() < 100; x++) {
    if (is_prime(x)) X.emplace_back(x);
  }
  vector<int64_t> cands;
  cands.emplace_back(1);
  for (int i = 0; i < (int)X.size(); i++) {
    for (int j = i; j < (int)X.size(); j++) {
      cands.emplace_back(X[i] * X[j]);
    }
  }
  sort(cands.begin(), cands.end());
  cout << cands[N - 1] << '\n';
  return 0;
}