using System;

public class Program

{

    public static void Main()

    {

         double p=0, c=0,n;

            for (int i = 0; i < 20; i++)

            {

                Console.WriteLine("Ingresa un numero");

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

                c = c+n;

​

            }

            p = c / 20;

            Console.WriteLine("El promedio es:"+p);

            Console.ReadLine();

    }

}