using System;

​

public class Program

{

    public static void Main()

    {

        int sum = 0;

        for (int i = 0; i < 10; i++)

        {

            int n = Int32.Parse(Console.ReadLine());

            if (n < 0)

            {

                break;

            }

​

            sum = sum + n;

        }

​

        Console.WriteLine("You have entered a negative number. Loop terminated");

        Console.WriteLine("sum = " + sum);

    }

}