using System;

public class Program

{

    public static void Main()

    {

        double pi = 3.1416;

        double r = 0;

        for (int i=1; i<=5; i++)

        {

            r =  r + 1;

            double a = pi*r*r;

            Console.WriteLine("Area of a Circle: {0:N4}", a);

        }

    }

}