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);

    }

}