using System;

public class Program

{

    public static void Main()

    {

        double esp = 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 >= esp);

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

    }

}