Simple program to determine the number of ticks it takes to open a combo lock

ComboCalculator.cs

using System;

namespace Yeet
{
    public class Program
    {
        static void Main(string[] args)
        {
            while (true)
            {
                Console.Write("Enter combo: ");
                string combo = Console.ReadLine();
                if (combo == "end") return;
                string[] comboArray = combo.Split(' ');
                try
                {

                    int comboA = int.Parse(comboArray[0]);
                    int comboB = int.Parse(comboArray[1]);
                    int comboC = int.Parse(comboArray[2]);
                    int tickNumber = ComboThingy(comboA, comboB, comboC);
                    Console.WriteLine("Number of ticks = " + tickNumber + "\n");
                }
                catch
                {
                    Console.WriteLine("Invalid combination\n");
                    continue;
                }
            }
        }

        static int ComboThingy(int comboA, int comboB, int comboC)
        {
            if (comboA < 0 || comboA > 39 || comboB < 0 || comboB > 39 || comboC < 0 || comboC > 39)
            {
                throw new Exception("Invalid combination");
            }

            int totalTicks = 0;
            const int FULL_TURN = 40;

            totalTicks += FULL_TURN;
            int diffAB = comboB - comboA;
            if (diffAB < 0)
            {
                diffAB += FULL_TURN;
            }
            totalTicks += diffAB;

            int diffBC = comboB - comboC;
            if (diffBC < 0)
            {
                diffBC += FULL_TURN;
            }
            totalTicks += diffBC;

            return totalTicks;
        }

    }

}