#include <iostream>
#include <vector>
#include <string>
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 ans = 0;
	for (int i = 0; i < N; i++){
		for (int j = 0; j < M; j++){
			if (A[i][j] == 'W'){
				ans++;
			}
		}
	}
	cout << ans << endl;
}