cashbox

using System;
using System.Collections.Generic;
using System.Runtime.CompilerServices;

namespace testing
{
    class Program
    {
        static void Main(string[] args)
        {
            Queue<int> clients = new Queue<int>();
            int currentSale;
            int cashbox = 0;

            clients.Enqueue(678);
            clients.Enqueue(19);
            clients.Enqueue(57);
            clients.Enqueue(2560);
            clients.Enqueue(189);
            clients.Enqueue(3505);
            clients.Enqueue(543);
            clients.Enqueue(300);
            clients.Enqueue(450);

            while (clients.Count > 0)
            {
                Console.WriteLine("Счет - " + cashbox);
                currentSale = clients.Dequeue();
                Console.WriteLine("Сумма покупки - " + currentSale);
                cashbox += currentSale;
                Console.ReadLine();
                Console.Clear();
            }
            Console.WriteLine("Вы обслужили всех клиентов!");
            Console.WriteLine("Счет - " + cashbox);
        }
    }
}