using System;
public class Program
{
    public static void Main()
    {
        long book = long.Parse(Console.ReadLine() ?? string.Empty);

        if(book == 1)
        {
            Console.WriteLine(316);
        }
        else
        {
            long page = (book - 1) * 52 + 316;
            Console.WriteLine(page);
        }
    }
}