#include <iostream>
using namespace std;

int main() {
	int N, M, ans = 0;
	cin >> N >> M;
	char A[N][M + 1];
	for (int i = 0; i < N; ++i) {
		cin >> A[i];
		for (int j = 0; j < M; ++j) {
			if (A[i][j] == 'W') ++ans;
		}
	}
	cout << ans;
}