#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main(){
  int H,W;
  cin>>H>>W;
  vector<vector<char>> S(H,vector<char>(W));
  int count = 0;
  for(int i=0;i<H;i++)for(int j=0;j<W;j++){
      cin>>S[i][j];
      count += (S[i][j] == 'W');
  }
  cout<<count<<endl;
}