#include <iostream>
#include <string>
using namespace std;
int main() {
	int N, M;
	cin >> N >> M;
	string* A = new string[N];
	for (int i = 0; i < N; i++) {
		cin >> A[i];
	}
	int count = 0;
	for (int i = 0; i < N; i++) {
		for (int j = 0; j < M; j++) {
			if (A[i][j] == 'W') {
				count++;
			}
		}
	}
	cout << count << endl;
	return 0;
}