Balanced Brackets

using System;

namespace balanced_brackets
{
    class Program
    {
        static void Main()
        {
            int numEntries = int.Parse(Console.ReadLine());
            int countOpen = 0;
            int countClose = 0;
            string previous = "";
            bool isBalanced = true;
            //string brackets = "";
            for (int i = 0; i < numEntries; i++)
            {
                string entry = Console.ReadLine();

                if (entry == "(")
                {
                    if (previous == "(")
                    {
                        isBalanced = false;

                    }
                    countOpen++;
                    previous = entry;
                }
                if (entry == ")")
                {
                    if (previous == ")")
                    {
                        isBalanced = false;

                    }
                    countClose++;
                    previous = entry;
                }

            }

            if (isBalanced && (countClose == countOpen) && previous == ")")
                Console.WriteLine("BALANCED");
            else
                Console.WriteLine("UNBALANCED");
        }
    }
}