using System;

​

public class Program

{

    public static void Main()

    {

        //daniela de la mora

        int x;

        int sum = 0;

        Console.WriteLine("How many number do you want to add.");

        x = int.Parse(Console.ReadLine());

        Console.WriteLine();

        for (int i = 1; i <= x; i++)

        {

            if (i == 1)

            {

                Console.WriteLine("Write the first number.");

                sum += int.Parse(Console.ReadLine());

            }

            else if (i == x)

            {

                Console.WriteLine("Write the last number.");

                sum += int.Parse(Console.ReadLine());

            }

            else

            {

                Console.WriteLine("Write a number.");

                sum += int.Parse(Console.ReadLine());

            }

        }

​

        Console.WriteLine("THE TOTAL ADDITION OF YOUR NUMBERS IS " + sum);

    }

}