Хьпсиьхе хь

using System;

public class Program
{
    public static void Main()
    {
        double radius = double.Parse(Console.ReadLine());
        double c = 3* 3.14 * radius;
        double s = 3.14 * radius * radius ;
        Console.WriteLine("C = {0}\n S = {1}", c,s);

    }
}