using System;

​

public class Program

{

     public static void Main()

    {

        Console.WriteLine("Enter three real numbers:");

​

        double num1 = Convert.ToDouble(Console.ReadLine());

        double num2 = Convert.ToDouble(Console.ReadLine());

        double num3 = Convert.ToDouble(Console.ReadLine());

        if (num1 * num2 * num3 > 0)

        {

            Console.WriteLine("The product is positive (+).");

        }

        else if (num1 * num2 * num3 < 0)

        {

            Console.WriteLine("The product is negative (-).");

        }

        else

        {

            Console.WriteLine("The product is zero.");

        }

    }

}

​