using System;
using System.Collections.Generic;
using static System.Console;
namespace ConsoleApp
{
    class Program
    {
        static void Main(string[] args)
        {
            double W = int.Parse(ReadLine());
            int D = int.Parse(ReadLine());
            double a;
            while(D > 1)
            {
                a = Math.Pow(D, 2);
                W -= Math.Floor(W / a);
                D--;
            }
            WriteLine(W);
        }
    }
}