using System;

public class Program

{

    public static void Main()

    {

        double M_CIRCLE,area,mohit;

        Console.WriteLine("ادخل طول القطر=");

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

        area=(M_CIRCLE/2)*(M_CIRCLE/2)*3.14;

        mohit=M_CIRCLE*3.14;

        Console.WriteLine("المساحة هي={0},المحيط هو={1}",area,mohit);

    }

}