using System;

public class Program

{

    public static void Main()

    {

        double pi = 3.14159265359;

        Console.WriteLine("Radie:");

        double radie = Convert.ToDouble(Console.ReadLine());

        Console.Write("A = ");

        Console.WriteLine(pi*radie*radie); //π * r * r

        Console.Write("O = ");

        Console.WriteLine(pi*radie*2); //π * d

    }

}