using System;

public class Program

{

    static double math(int a)

        {

            int n = 1;

            int k = 1;

            double t;

            for (int i = 0; i < a; i++)

            {

               t= Math.Pow(n, k);

                n++;

                k++;

            }

            return (1/(t));

        } 

    public static void Main()

    {

            }}