import java.util.Scanner;

public class yukicoder_299 {
	public static void main(String[] args) {
	
		Scanner scanner = new Scanner(System.in);
		
		long n = scanner.nextLong();
		
		long page = 316L;
		
		for (int i = 1; i < n; i++) {
			page += 52;
		}
		
		System.out.println(page);
	}
}