using System;
public class Program
{
    public static void Main()
    {
        int book = int.Parse(Console.ReadLine() ?? string.Empty);
        //string[] pass = (Console.ReadLine() ?? string.Empty).Trim().Split(' ');
        //string a = Console.ReadLine() ?? string.Empty;

        if(book == 1)
        {
            Console.WriteLine(316);
        }
        else
        {
            int page = 0;
            for (int i = 1; i <= book - 1; i++)
            {
                page += 52;
            }
            page+= 316;
            Console.WriteLine(page);
        }
    }
}