using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace yukicoderTest
{
    class Program
    {
        static void Main(string[] args)
        {
            string input = Console.ReadLine();
            long ban = long.Parse(input);
            long pluspage = (ban-1) * 52;
            long totalpage = 316 + pluspage;
            Console.WriteLine(totalpage);
            
        }

    }
}