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

public class Main {
	public static void main(String[] args) {
		BufferedReader buff = new BufferedReader(new InputStreamReader(System.in));

		try {
			BigInteger count = new BigInteger(Integer.parseInt(buff.readLine())-1 + "");
			BigInteger ans = new BigInteger("316");

			ans = ans.add(count.multiply(new BigInteger("52")));

			System.out.println(ans.toString());
		} catch (NumberFormatException e) {
			e.getStackTrace();
		} catch (IOException e) {
			e.getStackTrace();
		} catch (Exception e) {
			e.getStackTrace();
		}
	}
}