using System;

​

​

namespace Низове2

{

    class Program

    {

        static void Main(string[] args)

        {

            string s = Console.ReadLine();

​

            char[] charArray = s.ToCharArray();

            int opening = 0;

            int closing = 0;

            String output = "";

            for(int i=0;i<charArray.Length;i++)

            {

                if (charArray[i] == '(') opening++;

                else if (charArray[i] == ')') closing++;

                if(closing>opening)

                {

                    output = "false";

                    break;

                }

            }

            if(opening>closing)

            {

                output = "false";

            }

            else if (opening == closing)

            {

                output = "true";

            }

            Console.WriteLine(output);

        }

    }

}