using System;

public class Program

{

    public static void Main()

    {

        double pi = 3.1416;

        double r;

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

        {

        Console.WriteLine("\nInput Radius: ");

        r = double.Parse(Console.ReadLine());

            while (i<=r)

            {

        double a = pi*r*r;

        Console.WriteLine("r= {0:N1}\nArea of a Circle: {1:N4}", r, a);

        r+= 1;

            }

        }

    }

}