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