очередь

using System;
using System.Collections.Generic;

namespace CSLight
{
    class Program
    {
        static void Main(string[] args)
        {
            int numberOfClients, clientMoney ;
            int storeProfit = 0;
            Queue<int> amountOfPurchases = new Queue<int>();
            amountOfPurchases.Enqueue(1);
            amountOfPurchases.Enqueue(1);
            amountOfPurchases.Enqueue(1);
            amountOfPurchases.Enqueue(1);
            amountOfPurchases.Enqueue(1);
            amountOfPurchases.Enqueue(1);
            numberOfClients = amountOfPurchases.Count;
            for (int i = 0; i < numberOfClients; i++)
            {
                clientMoney = amountOfPurchases.Dequeue();
                storeProfit += clientMoney;
                Console.WriteLine($"Прибыль магазина после обслуживания клиента: {storeProfit}");
                Console.ReadKey();
                Console.Clear();
            }
        }
    }
}