#include <bits/stdc++.h>

using namespace std;

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