#include <iostream>
using namespace std;
int main(void) {
	int n, m;
	cin >> n >> m;
	string s;
	int cnt = 0;
	for (int i = 0; i < n; ++i) {
		cin >> s;
		for (int j = 0; j < m; ++j) {
			if (s[j] == 'W') ++cnt;
		}
	}
	cout << cnt << endl;
	return 0;
}