class Program
{
    static void Main(string[] args)
    {
        string[] inputNum = Console.ReadLine()!.Split(' ');
        int row = int.Parse(inputNum[0]);
        int count = 0;

        for (int i = 0; i < row; i++)
        {
            string input = Console.ReadLine()!;
            foreach (char c in input)
            {
                if (c == 'W')
                {
                    count++;
                }
            }
        }
        Console.WriteLine(count);
    }
}