#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  cin.tie(nullptr)->sync_with_stdio(false);
  // OEIS A040121 https://oeis.org/A040121
  int n;
  cin >> n;
  vector<int> a = { 7, 11, 13, 17, 19, 23, 29, 47, 59, 61 };
  cout << a[n - 1] << "\n";
  return 0;
}