#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
int main(void){
  int N, M;
  cin >> N >> M;
  vector<string> A(N);
  int cnt = 0;
  for(int i = 0; i < N; i++){
    cin >> A[i];
    for(int j = 0; j < M; j++){
      if('W' == A[i][j]){
        cnt++;

      }
    }
  }
  cout << cnt << endl;
  return 0;
}