homework 1 #3

using System;

namespace IDK
{
    class Program
    {
        static void Main()
        {
            int r = int.Parse(Console.ReadLine());
            double area = Math.PI * (r * r);
            double per = 2 * Math.PI * r;
            Console.WriteLine("Litseto e: " + area);
            Console.WriteLine("Obikolkata e: " + per);
        }
    }
}