using System;               

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Celso Alberto Reyes Ugalde");

        float r;

        float pi = 3.1415926535f;

        Console.Write("Radius: ");

        r = Convert.ToSingle(Console.ReadLine());

        Console.WriteLine( 4 * pi * (r * r) );

        Console.WriteLine( 4f/3f * pi * (r * r * r));

    }

}

​

​