using System;
using System.Collections.Generic;
using System.Linq;
using System.IO;
using System.Text;
using static System.Console;
using static System.Math;

namespace CP
{
    class Atria
    {
        static void Main(string[] args)
        {
            long n = long.Parse(ReadLine());
            WriteLine(
                316 + (52 * (n-1))
                );
        }
    }
}