05. Multiplication Sign

using System;

namespace _05._Multiplication_Sign
{
    class Program
    {
        static void Main(string[] args)
        {
            int firstNumber = int.Parse(Console.ReadLine());
            int secondNumber = int.Parse(Console.ReadLine());
            int thirdNumber = int.Parse(Console.ReadLine());

            PintSing(firstNumber, secondNumber, thirdNumber);


        }
        static void PintSing(int firstNumber, int secondNumber , int thirdNumber)
        {
            int counerNegativ = 0;

            if (firstNumber == 0 || secondNumber == 0 || thirdNumber == 0)
            {
                Console.WriteLine("zero");
                return;
            }
            if (firstNumber < 0)
            {
                counerNegativ++;
            }
            if (secondNumber < 0)
            {
                counerNegativ++;
            }
            if (thirdNumber < 0)
            {
                counerNegativ++;
            }

            if (counerNegativ % 2 == 1)
            {
                Console.WriteLine("negative");
            }
            else
            {
                Console.WriteLine("positive");
            }

        }
    }
}