using System;

public class Program

{

    public static void Main()

    {   

        double v;

        double r;

        Console.WriteLine("Introdueix el radi: ");

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

        v = (4/3) * 3.14 * (r*r*r);

        Console.WriteLine("El volum es de " + v);

    }

}