// yukicoder No.712
#include <bits/stdc++.h>
using namespace std;

int main()
{
  int n, m; cin >> n >> m;
  vector<string> v(n);
  for(int i = 0; i < n; ++i) cin >> v[i];

  int counter = 0;
  for(int i = 0; i < n; ++i) {
    for(int j = 0; j < 3; ++j) {
      if(v[i][j] == 'W') ++counter;
      else continue;
    }
  }

  cout << counter << "\n";

  return 0;
}