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

using namespace std;

int main() {
  int ans = 0;
  int h, w;
  cin >> h >> w;
  for (int i = 0; i < h; i++) {
    string s;
    cin >> s;
    ans += count(s.begin(), s.end(), 'W');
  }
  cout << ans << endl;
}