using System;

​

public class Program

{

    public void swaps(string str)

    {

        Char[] ch = str.ToCharArray();

        int swap = 0;

        int right = 0;

        int left = 0;

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

        {

            if (ch[i].ToString() == "[")

            {

                right++;

            }

            else

            {

                left++;

            }

​

            if (left > right)

            {

                swap++;

            }

        }

​

        Console.WriteLine(swap);

    }

​

    public static void Main()

    {

        string str = "[[][]]";

        Program program = new Program();

        program.swaps(str);

    }

}