RomaCalculator.Calculator.AddUpAllIfPossible C# (CSharp) Method

        private int AddUpAllIfPossible(List<int> abacus, int previousCount, int result)
        {
            if (abacus.Count == previousCount)
            {
                foreach (var item in abacus)
                {
                    result += item;
                }
                abacus.Clear();
            }
            return result;
        }