import java.util.Scanner;

public class Main {

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

		long N = scan.nextLong();
		long pageBase = 316;
		int pagePerIssue = 52;
		long pageTotal = pageBase + pagePerIssue * N - pagePerIssue;

		System.out.println(pageTotal);

		scan.close();
	}

}