using System;
using System.IO;

namespace D01._2
{
    class Program
    {
        static void Main(string[] args)
        {
            if (args.Length < 1) return;
            if (File.Exists(args[0]) == false) throw new FileNotFoundException();

            int floor = 0;

            string text = "";
            using (var file = File.OpenText(args[0]))
            {
                text = file.ReadToEnd();
            }

            int c = 0;
            foreach (var car in text)
            {
                c++;
                if (car == '(') floor++;
                if (car == ')') floor--;

                if (floor == -1) break;
            }

            Console.WriteLine($"Answer is : {c}");
        }
    }
}