using System;
using System.Collections.Generic;
using System.Linq;
using static System.Console;

class Program
{
    static void Main()
    {
        var NM = ReadLine().Split().Select(int.Parse).ToArray();
        var a = 0;
        for (int i = 0; i < NM[0]; i++)
        {
            a += ReadLine().Count(x => x == 'W');
        }
        WriteLine(a);
    }
}