using System;

public class Program

{

    public static void Main() System;

public class Program

{

    public static void Main()

    {

    int num, a, b , c, total;

        total = 0;

        Console.WriteLine("how many numbers you would like to add.");

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

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

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

            for( int l = 1; l <= num - 2; l++) 

            { 

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

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

                 total = total + b;

            } 

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

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

        Console.WriteLine(a + total + c);

    }

}

    {

    int num, a, b , c, total;

        total = 0;

        Console.WriteLine("how many numbers you would like to add.");

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

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

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

            for( int l = 1; l <= num - 2; l++) 

            { 

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

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

                 total = total + b;

            } 

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

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

        Console.WriteLine(a + total + c);

    }

}