#include <bits/stdc++.h>
using namespace std;

int main() {
    int n, m, ans = 0;
    string s;
    cin >> n >> m;
    while (n--) {
        cin >> s;
        ans += count_if(s.begin(), s.end(), [](char c) { return (c == 'W'); });
    }
    cout << ans << endl;
    return 0;
}