#include<iostream>
#include<algorithm>
#include<string>
#include<vector>
using namespace std;
using ll = long long;

int main() {
	int n, m;
	cin >> n >> m;
	string s[n];
	int ans = 0;
	for (int i = 0;i < n;i++) {
		cin >> s[i];
		for (int j = 0;j < m;j++) {
			if (s[i][j] == 'W')ans++;
		}
	}
	cout << ans << endl;
}