using System;

public class Program

{

    public  void Main()

    {

        CheckParentheses ("()");

    }

    public void CheckParentheses (string inputParentheses){

    int openParentheses  = 0;

    int closeParentheses = 0;

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

    {

       if (inputParentheses[i] == '(') 

        {

            openParentheses++;

        }

         if (inputParentheses[i] == ')') {

            closeParentheses++;

         }

         if (openParentheses == closeParentheses) 

            Console.WriteLine("true");   

     }

    } 

​

}