#include<iostream>
#include<string>
#include<vector>
#include<algorithm>

using namespace std;

int main() {

	int n, w;
	char flag;

	cin >> n >> w;

	int count = 0;
	for (int i = 0;i < n;i++) {
		for (int j = 0;j < w;j++) {
			cin >> flag;
			if (flag == 'W')count++;
		}
	}

	cout << count << endl;

	return 0;
}