05.MultiplicationSign

using System;

namespace _05.MultiplicationSign
{
    class Program
    {
        static void Main(string[] args)
        {
            int num1 = int.Parse(Console.ReadLine());
            int num2 = int.Parse(Console.ReadLine());
            int num3 = int.Parse(Console.ReadLine());

            PrintResult(num1, num2, num3);

        }

        private static void PrintResult(int num1, int num2, int num3)
        {
            if (IsZero(num1, num2, num3))
            {
                Console.WriteLine("zero");
            }
            else if (IsNegative(num1, num2, num3))
            {
                Console.WriteLine("negative");
            }
            else
            {
                Console.WriteLine("positive");
            }
        }
        private static bool IsZero(int num1, int num2, int num3)
        {
            if (num1 == 0 ||
                num2 == 0 ||
                num3 == 0)
            {
                return true;
            }
            return false;
        }

        private static bool IsNegative(int num1, int num2, int num3)
        {
            int[] numbers = new int[] { num1, num2, num3 };
            int counter = 0;
            for (int i = 0; i < 3; i++)
            {
                if (numbers[i] < 0)
                {
                    counter++;
                }
            }
            if (counter % 2 == 0)
            {
                return false;
            }
            return true;
        }
    }
}