using System;

public class Program {
	public void Solve() {
		const int diff = 52;
		long page = 316;
		long N = long.Parse(Console.ReadLine());
		for (int i = 1; i < N; i++) {
			page += diff;
		}
		Console.WriteLine(page);
	}
	
	public static void Main(string[] args) {
		Program program = new Program();
		program.Solve();
	}
}