class Program
    {
        static void Main(string[] args)
        {
            int num, a, b, c;
            Console.Write("Enter a: ");
            a = int.Parse(Console.ReadLine());

            Console.Write("Enter b: ");
            b = int.Parse(Console.ReadLine());

            Console.Write("Enter c: ");
            c = int.Parse(Console.ReadLine());

            int sumOfOddNumber = 0;
            int productOfPositiveNumbers = 1;
            do
            {
                Console.Write("Enter number: ");
                num = int.Parse(Console.ReadLine());
                if (num % 2 == 1)
                {
                    sumOfOddNumber += num;
                }

                if (num > 0)
                {
                    productOfPositiveNumbers *= num;
                }
            } while (num != 0);
            Console.WriteLine("Sum of all odd numbers is: {0}", sumOfOddNumber);

            Console.WriteLine("Sredno geometrichno na 8-te polojitelni chisla e: {0:0.00}", Math.Pow(productOfPositiveNumbers, 1 / 8));

            Console.WriteLine("Sss(|a - b|) * Sss(b + c) = {0}",
                (Sss(Math.Abs(a - b)) * Sss(b + c)));
        }

        private static int Sss(int k)
        {
            Random rnd = new Random();
            int product = 1;
            for (int i = 0; i < k; i++)
            {
                int num = rnd.Next(-50, 150);
                if (num.ToString().Count() == 2)
                {
                    if (num.ToString()[1] == '5')
                    {
                        product *= num;
                    }
                }
            }

            return product;
        }
    }