using System;

namespace Interest
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            double sumYear1 = n * 0.05 + n;
            double sumYear2 = sumYear1 * 0.05 + sumYear1;
            double sumYear3 = sumYear2 * 0.05 + sumYear2;



            Console.WriteLine(Math.Round(sumYear3, 2));
        }
    }
}