while (number_of_parameters <= 2)
            {
                try
                {
                    Console.Write("Enter number of parameters that your function will have: ");
                    number_of_parameters = uint.Parse(Console.ReadLine());
                    if (number_of_parameters == 0 || number_of_parameters == 1 || number_of_parameters == 2)
                        Console.WriteLine("Function cannot be linear!");
                }
                catch (Exception)
                {
                    Console.WriteLine("You have to input uint type!");
                }
            }