RomaCalculator.Calculator.SubtractThatPossible C# (CSharp) Method

        private void SubtractThatPossible(List<int> abacus)
        {
            for (int i = 0; i < abacus.Count - 1; i++)
            {
                if (abacus[i] < abacus[i + 1])
                {
                    abacus[i] = abacus[i + 1] - abacus[i];
                    abacus.RemoveAt(i + 1);
                    i = abacus.Count;
                }
            }
        }