using System;

public class Program

{

    public int CountChar (String line, Char item)

    {

        int ans = 0;

        foreach(Char it in line)

            if(it == item)

                ans++;

        return ans;

    }

    public static void Main()

    {

        String line = "";

        int n = 8;

        int ans = 0;

        bool met = false;

        bool a = true;

        while(a)

        {

             line = Console.ReadLine();

            if ( line == "BBBBBBBB")

                ans ++;

            else if (!met)

            {

                met = true;

                Program pr = new Program ();

                int function = pr.CountChar(line,'B');

                ans += function;

            }

            n--;

            if (n == 0)

                a = false;

        }

        Console.WriteLine(ans);

    }

}