for (int i = 1; i <= thirdNumber; i++)
                {
                    for (int j = 1; j <= secondNumer; j++)
                    {
                        for (int k = 1; k <= firstNumber; k++)
                        {
                            Console.WriteLine($"{i} * {j} * {k} = {k* j *i};");
                        }
                    }
                }