import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);

		long N = scan.nextLong();
		long page = 316;
		int pagePerIssue = 52;

		for(int i = 1; i < N; i++){
			page += pagePerIssue;
		}

		System.out.println(page);

		scan.close();
	}

}