using System;

​

public class Program

{

    public static double F(double x, int n)

    {

        if (n < 0 || x == 0)

        {

            return 0;

        }

        else if (n == 0)

        {

            return 1;

        }

        else

        {

            return 1 / Math.Pow(x, n) + F(x, n - 1);

        }

    }

​

    public static void Main()

    {

        double x = double.Parse(Console.ReadLine());

        int n = int.Parse(Console.ReadLine());

        Console.WriteLine(F(x, n));

    }

}