06. Balanced Brackets

using System;

namespace BalancedBrackets
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine()),
                openBrackets = 0;
            string bracket;

            for (int i = 0; i < n; i++)
            {
                bracket = Console.ReadLine();
                if (bracket == ")") {
                    openBrackets--;
                    if (openBrackets < 0) {
                        break;
                    }
                } else if (bracket == "(") {
                    openBrackets++;
                    if (openBrackets > 1) {
                        break;
                    }
                }
            }

            if (openBrackets == 0)
            {
                Console.WriteLine("BALANCED");
            }
            else
            {
                Console.WriteLine("UNBALANCED");
            }
        }
    }
}