using System;

public class Hello
{
    public static void Main()
    {
        string[] line = Console.ReadLine().Trim().Split(' ');
        var n = int.Parse(line[0]);
        var m = int.Parse(line[1]);
        var ans = 0;
        for (int i = 0; i < n; i++)
        {
            var s = Console.ReadLine().Trim();
            ans += m - s.Replace("W", "").Length;
        }
        Console.WriteLine(ans);
    }
}