15.Balanced Brackets

using System;

namespace P15_BalancedBrackets
{
    class P15_BalancedBrackets
    {
        static void Main(string[] args)
        {
            byte n = byte.Parse(Console.ReadLine());
            byte open = 0;      // OPENING BRACKETS
            byte close = 0;     // CLOSING BRACKETS

            for(byte i = 1; i <= n; i++)
            {
                if(open == 1 && close == 1) // RESET
                {
                    open--;
                    close--;
                }

                string input = Console.ReadLine();
                switch(input)
                {
                    case "(":
                        open++;
                        break;
                    case ")":
                        close++;
                        break;
                }
            }
            if(open == 0 && close == 0)
            {
                Console.WriteLine("BALANCED");
            }
            else
            {
                Console.WriteLine("UNBALANCED");
            }
        }
    }
}