using System;

public class Program

{

    public static void Main()

    { 

     double k,sum=0;

        double x = Convert.ToDouble(Console.ReadLine());

        double n = Convert.ToDouble(Console.ReadLine());

        k=1;

       for(int i=2;i<n+2;i++)

       {

           sum=sum+(x/k);

           k=k+i;

       }

        Console.WriteLine(sum);

    }

}

​