using System;
 
namespace test
{
    class Program
    {
        static bool isUpperArrival = false;
        static bool isLowerArrival = false;
        static void Main(string[] args)
        {
            var upper = 10;
            var lower = -10;
            var num = 7;
            Console.WriteLine(num);
            for (var i = 0; i < 100; i++)
            {
                if (ShouldUp(num, lower, upper))
                    num++;
                else
                    num--;
                Console.WriteLine(num);
            }
            Console.ReadLine();
        }
        static bool ShouldUp(int number, int lower, int upper)
        {
            if (number <= lower)
            {
                isLowerArrival = true;
                isUpperArrival = false;
                return true;
            }
            if (number >= upper)
            {
                isLowerArrival = false;
                isUpperArrival = true;
                return false;
            }
            if (isLowerArrival)
                return true;
            if (isUpperArrival)
                return false;
            return false;
        }
    }
}
 

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