#include <bits/stdc++.h>
#define rep(i, ss, ee) for (int i = ss; i < ee; ++i)
using namespace std;

size_t countStr(const std::string &src, const char &c) {
  return std::count(std::cbegin(src), std::cend(src), c);
}

void solve() {
  int N, M;
  size_t ans = 0;
  string s;
  cin >> N >> M;
  rep(i, 0, N) {
    cin >> s;
    ans += countStr(s, 'W');
  }
  cout << ans << endl;
}

int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  solve();
  getchar();
}