#include <bits/stdc++.h>
#define FOR(i,x,y) for(int i = x;i < y;i++)
#define INF 1e9+7
using namespace std;
int main(){
  int N,M,ans=0;
  cin >> N >> M;
  char c;
  FOR(i,0,N*M){
    cin >> c;
    if(c == 'W')ans++;
  }
  cout << ans << endl;
}