using System;

public class Program

{

    public static void Main()

    {

         double eps=0.001;

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

        double x = a/2.0;

        double xs=x;

        do

        {

            xs = x;

            x=(x+a/x)/2;

            Console.WriteLine("{0}, точност {1}", x, xs-x);

        }

        while(xs-x>= eps);

        Console.WriteLine(Math.Round(x,2));

    }

}