#include <bits/stdc++.h>

using namespace std;

int main() {
    int n, m;
    cin >> n >> m;

    int ans = 0;
    for (int i = 0; i < m * n; ++i) {
        char c;
        cin >> c;
        if (c == 'W') ans++;
    }

    cout << ans << endl;
    return 0;
}