#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <iomanip>
#include <stack>
#include <algorithm>
#include <string>
#include <map>
#include <iterator>
#include <set>
#include <queue>

using namespace std;

long long calc(long long N) {
    long long a = 316;
    return a + (N - 1) * 52;
}

int main() {

    long long N;
    cin >> N;

    cout << calc(N) << endl;


    return 0;

}