#include <bits/stdc++.h>
using namespace std;
signed main() {
  ios::sync_with_stdio(false);
  int n, m;
  cin >> n >> m;
  vector<string> g(n);
  for (int i = 0; i < n; ++i) cin >> g[i];
  cout << accumulate(g.begin(), g.end(), 0, [](int o, const string &s) {
    return o + count(s.begin(), s.end(), 'W');
  }) << endl;
}