using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Please enter the following values in cm.");

        Console.WriteLine("Please enter the radius of the circle:");

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

        Console.WriteLine("The area of the circle is:");

        Console.WriteLine(radius * radius * 3.1415926535897932384626433832795 + " square centimetres");

    }

}