using System;

public class Program

{

    public static void Main()

    {

    double g,s,p;

        Console.WriteLine ("طول قطر الدائرة");

        g=double.Parse(Console.ReadLine());

        s=g/2*3.14*g/2;

        p=g*3.14;

        Console.WriteLine ("the s ={0} and the m={1}",s,p);

    }

}