using System;

public class Program

{

    public static void Main()

    {

        Console.Write("r = ");

        var r = double.Parse(Console.ReadLine());

        var area = Math.Round(Math.PI * r * r, 2);

        var perimeter = Math.Round(2 * Math.PI * r, 2);

        Console.WriteLine(" area = " +area);

        Console.WriteLine(" perimeter = " +perimeter);

    }

}