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

public class No00000299_Main {
	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		System.out.println(316 + 52 * (Long.parseLong(br.readLine()) - 1));
	}
}