public override string GetSolution()
        {
            long output = 0;

            NumberSequence phaseSetting = new NumberSequence(5, 4);

            while (true)
            {
                if (phaseSetting.IsUnique())
                {
                    long ampOutput = 0;
                    for (int i = 0; i < amps.Length; i++)
                    {
                        amps[i].Load();
                        amps[i].AddInput(phaseSetting[i]);
                        amps[i].AddInput(ampOutput);
                        amps[i].Run();
                        ampOutput = amps[i].GetOutput();
                    }

                    if (ampOutput > output)
                    {
                        output = ampOutput;
                    }
                }

                if (!phaseSetting.Increase())
                {
                    break;
                }
            }

            return(output.ToString());
        }