using System;

public class Program

{

    public static void Main()

    {

        double tipoDoble = 5.1;

        Console.WriteLine("Hello World");

        long tipoLong=(long)tipoDoble;

        Console.WriteLine(tipoLong);

        tipoDoble=5e9d;

        Console.WriteLine(tipoDoble);

        int tipoInt=(int)tipoDoble;

        Console.WriteLine(tipoInt);

    }

}