using System;

namespace Demo
{
    class Program
    {
        static void Main(string[] args)
        {
            double radius = double.Parse(Console.ReadLine()); // въвеждаме SoftUni
            double perimeter = Math.PI * radius*2;
            double area = Math.PI * Math.Pow(radius,2);

            Console.WriteLine($"{area:f2}");
            Console.WriteLine($"{perimeter:f2} ");






        }
    }
}