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

using namespace std;

int main() {
  int n, m;
  string s;
  cin >> n >> m;

  for (int i=0; i<n; i++) {
    string t;
    cin >> t;
    s+=t;
  }

  cout << count(s.begin(), s.end(), 'W') << endl;
}