using System;

public class Program

{

    public static void Main()

    {

        double p = 0;

            double n = 0;

            for (int i = 100; i >= 1; i--)

            {

                double fraction = 1.0 / i;

                if (i % 2 == 0)

                {

                    n += fraction;

                }

                else

                {

                    p += fraction;

                }

            }

        Console.WriteLine( "p = " + p);

        Console.WriteLine("n = " + n);

        Console.WriteLine("p + n =" + (p - n));

    }

}