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);
}