static void Main(string[] args)
        {
            string option;
            bool   loop = true;

            while (loop)
            {
                bool vertical = true;

                Console.WriteLine("0-time, 1-distance, 2-v_0, 3-v_f, 4-exit");
                option = Console.ReadLine();

                Console.WriteLine("Is the movement horizontal? 1 - yes");
                var s = Console.ReadLine();
                if (!string.IsNullOrWhiteSpace(s) && int.Parse(s) == 1)
                {
                    vertical = false;
                }

                Equations eqn = new Equations(vertical);
                switch (option)
                {
                case "0":
                    eqn.CalculateTime();
                    break;

                case "1":
                    eqn.CalculateDistance();
                    break;

                case "2":
                    eqn.CalculateInitialVelocity();
                    break;

                case "3":
                    eqn.CalculateFinalVelocity();
                    break;

                case "4":
                    loop = false;;
                    break;
                }
                Console.WriteLine($"Result: <{eqn.Result}>");
            }
        }