#include <bits/stdc++.h>
#define rep(i, ss, ee) for (int i = ss; i < ee; ++i)
using namespace std;
using ull = unsigned long long;

ull solve() {
  ull N;
  cin >> N;
  return 316 + (52 * (N - 1));
}

int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  cout << solve() << endl;
  getchar();
}