using System;

public class Program

{

    public static void Main()

    {

        Console.Write("Enter radius of circle: ");

        ulong radius = ulong.Parse(Console.ReadLine());

        double pi = 3.1415926535;

        Console.WriteLine("Area of circle: " + pi * radius * radius);

        Console.WriteLine("Circumference of circle: " + 2 * pi * radius);

    }

}