using System;

public class Program

{

    public static void Main()

    {

    double eps = 0.001; 

    Console.Write("ä=");

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

        double x = a/2.0;

        double xs;

        do

        {

         xs=x;

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

        }

                while (xs - x >= eps);

        Console.WriteLine("Koren kvadraten e: {0}",x);

}

}

​