#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define rep(i,n) for(int (i)=0;(i)<(n);(i)++)

int main() {
  int n,m; cin>>n>>m;
  vector<string> as(n);
  rep(i,n) cin>>as[i];
  int ans=0;
  rep(i,n) rep(j,m) if(as[i][j]=='W') ans++;
  cout<<ans<<endl;
  return 0;
}