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

namespace ConsoleApp132
{
    class Program
    {
        static void Main(string[] args)
        {
            long  n = long .Parse(Console.ReadLine());
            Console.WriteLine((n-1) * 52 + 316);
        }
    }
}