using System;

public class Program

{

    public static void Main()

    {

        //Declarar

            double prom;

            int suma = 0;

        //Iniciar ciclo

            for (int i = 0; i <=19; i++)

            {

                Console.WriteLine(i);

                suma = suma + i;

            }

            prom = suma / 20;

            Console.WriteLine("Promedio = " + prom);        

​

    }

}