#include<iostream>
#include<string>
#include<algorithm>
#include<cmath>
#include<math.h>
#include<iomanip>
#include<stdio.h>
#include<cstring>
using namespace std;
 
int main(){

  long long int n, ans;
  cin >> n;
  ans=52*(n-1)+316;
  cout << ans << endl;

  return 0;
}