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

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

	vector<vector<char>> v(n, vector<char>(m));
	int cnt = 0;
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < m; j++) {
			char c;
			cin >> c;
			if (c == 'W') cnt++;
			v.at(i).at(j) = c;
		}
	}

	cout << cnt << endl;
}