#include<iostream>
#include<algorithm>
#include <vector>
#include<cmath>
using namespace std;
int main() {
	int N, M;
	cin >> N >> M;
	int S = M * N;
	vector<char>vec(S);
	for (int ia = 0; ia < S; ia++) {
		cin >> vec.at(ia);
	}
	int cnt = 0;
	for (int ib = 0; ib < S; ib++) {
		if (vec.at(ib) == 'W') {
			cnt++;
		}
		else continue;
	}
	cout << cnt << endl;
}