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

int main() {
	int N, M, count = 0;
	string S;
	cin >> N >> M;
	for (int i = 0; i < N; i++) {
		cin >> S;
		for (int j = 0; j < M; j++) {
			if (S[j] == 'W') count++;
		}
	}
	cout << count;
}