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

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