using System;

public class Program

{

    public static void Main()

    {

        double BASE, ALTURA, RESUL;

        string linea;

        Console.Write("DIGITE LA BASE :"); linea = Console.ReadLine();

        BASE = double.Parse(linea);

        Console.Write("DIGITE LA ALTURA :"); linea = Console.ReadLine();

        ALTURA = double.Parse(linea);

        RESUL = (BASE * ALTURA) / 2;

        Console.WriteLine("AREA TRIANGULO :" + String.Format("{0:####.00}", RESUL));

        Console.WriteLine("AREA TRIANGULO :" + String.Format("{0:c}", RESUL));

        Console.WriteLine("AREA TRIANGULO :" + String.Format("{0:f}", RESUL));

        Console.WriteLine("AREA TRIANGULO :" + String.Format("{0:g}", RESUL));

        Console.WriteLine();

        Console.WriteLine("HOY ES: " + String.Format("Hoy es {0:f}", DateTime.Now));

        Console.WriteLine("HOY ES: " + String.Format("Hoy es {0:dddd}{0:dd/MM/yyy}", DateTime.Now));

        Console.Write("Pulse una tecla :"); Console.ReadLine();

    }

}