#include <iostream>
#include <string>
#include <vector>
using namespace std;

int main(void)
{
    int N, M;
    cin >> N >> M;
    int ans = 0;
    for (int i = 0; i < N; ++i)
    {
        string s;
        cin >> s;
        for (int j = 0; j < M; ++j)
        {
            if (s[i] == 'W')
                ans++;
        }
    }
    cout << ans << endl;
    return 0;
}