#include <bits/stdc++.h>
using namespace std;
template <typename T>
void sci(T& t) {
  cin >> t;
}
template <typename T, typename... Ts>
void sci(T& t, Ts&... ts) {
  sci(t);
  sci(ts...);
}
int32_t main() {
  cin.tie(nullptr);
  cout.tie(nullptr);
  ios_base::sync_with_stdio(false);
  int64_t a;
  sci(a);
  vector<int64_t> kek = {
      4,   22,  27,  58,  85,  94,  121, 166, 202, 265, 274,  319,  346,
      355, 378, 382, 391, 438, 454, 483, 517, 526, 535, 562,  576,  588,
      627, 634, 636, 645, 648, 654, 663, 666, 690, 706, 728,  729,  762,
      778, 825, 852, 861, 895, 913, 915, 922, 958, 985, 1086, 1111, 1165};
  cout << kek[a - 1];
  return 0;
}
