import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

import static java.lang.System.in;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(in));
        long N = Long.parseLong(reader.readLine());
        System.out.println(predict(N));
    }

    private static long predict(long n) {
        return 52 * n + 264;
    }
}