#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  int a[] = {0,   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};
  cout << a[n];
}
