static void Main(string[] args)
        {// Aquest programa realitza la multiplicacio dels nombres entrats per teclat sense fer servir el producte.
            int firstValue=-1, secondValue=-1, aux=0;
            while (firstValue <= 0 || secondValue <= 0)
            {
                Console.Write("ENTER THE FIRST POSITIVE VALUE: ");
                firstValue = Convert.ToInt32(Console.ReadLine());
                Console.Write("ENTER THE SECOND POSITIVE VALUE: ");
                secondValue = Convert.ToInt32(Console.ReadLine());
            }
            if (firstValue >= secondValue)
            {
                for (int i = secondValue; i > 0; i--)
                {
                    aux = aux + firstValue;
                }
                Console.WriteLine("{0} x {1} = {2}", secondValue, firstValue, aux);
            }
            else
            {
                for (int i = firstValue; i > 0; i--)
                {
                    aux = aux + secondValue;
                }
                Console.WriteLine("{0} x {1} = {2}", firstValue, secondValue, aux);
            }
        }
    }
}