using System;

using System.Text;

using System.Linq;

using System.Collections;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        List<int> numbers = new List<int>();

        Console.WriteLine("Enter your numbers below, 1 per line");

        string input = "";

        int inputNumber = 0;

        while((input = Console.ReadLine()) != "-1"){

            int.TryParse(input, out inputNumber);

            numbers.Add(inputNumber);

        }

        int sum = numbers.Sum();

        Console.WriteLine("Total Sum: " + sum);

    }

}