#include <iostream>
using namespace std;
int main(){
  int a,b,count=0;
char k[55][55];
cin>>a>>b;
for(int i=0;i<a;++i){
  for(int j=0;j<b;++j){
  cin>>k[i][j];
if(k[i][j]=='W') count++;
}
}
cout<<count<<endl;
}