using System;

public class Program

{

    public static void Main()

    {

        double r = Convert.ToInt32(Console.ReadLine());

        double s = 2 * Math.PI * r;

        double d = Math.PI * Math.Pow(r, 2);    

        Console.WriteLine("{0:0.##0}", d);

        Console.WriteLine("{0:0.###}", s);

    }

}