using System;


public class Test
{
    public static void Main ()
    {


        double x, n = 1, s = 1, i = 1, c = 0.0001;

        do {
            Console.WriteLine ("Input x: ");

        } while(!double.TryParse (Console.ReadLine (), out x));



        while (n > c) {
            s += n;


            n = 1 / ((double)Math.Pow (x, 2 * i));
            Console.WriteLine ((1 / (double)Math.Pow (x, 2 * i)) + "\t" + "i = " + i + " ");

            Console.Write (s + "\n");

            i++;



        }
        //Console.WriteLine (s);
        Console.ReadLine ();
    }
}