using System;

public class Program

{

    public static void Main()

    {

        //Ana Cecilia Hernández Mireles

        int num, x;

        int tot = 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 fist number.");

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

                    tot += x;

                }

                else if ( i == num)

                {

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

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

                    tot += x;

                }

                else 

                {

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

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

                    tot += x;

                }

            }

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

    }

}