using System;

public class Program

{

    public static void Main()

    {

        //Marifer Ortega

        int num;

        int x;

        int total;

        total =0;

        Console.WriteLine("Hello! How many numbers would you like to add?");

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

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

        {

            if(i == 1)

            {

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

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

                total +=x;

            }

        else if(i == num)

        {

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

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

            total +=x;

        }

        else

        {

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

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

            total +=x;

        }

        }

            Console.WriteLine("The total addition of the number is:" + " " + total);

    }

}