#include <iostream>
#include <algorithm>
using namespace std;

int main() {
    int N,M;
    cin >>N>>M;
    int cnt = 0;
    for (int i = 0; i < N; i++) {
        string s;
        cin >> s;
        cnt += count(s.begin(), s.end(), 'W');
    }
    cout << cnt << endl;
    return 0;
}