#include <bits/stdc++.h>
using namespace std;

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