//inlclude前用define 
#define _USE_MATH_DEFINES

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

using namespace std;
//typedef
typedef vector<int> VI;
typedef vector<string> VS;
typedef vector<char> VC;

int main() {
	int n, m;
	cin >> n >> m;
	
	VS a(n);
	for (int i = 0; i < n; i++) cin >> a[i];
	int cnt = 0;

	for (int i = 0; i < n; i++) {
		for (int j = 0; j < m; j++) {
			if (a[i][j] == 'W') cnt++;
		}
	}
	cout << cnt << endl;
	return 0;
}