#include <iostream>
#define FOR(i,x,y) for(int i=x;i<y;i++)
using namespace std;
int main(){
    int n,m,ans=0;
    char c;
    cin>>n>>m;
    FOR(i,0,n*m){
        cin>>c;
        if(c=='W')ans++;
    }
    cout<<ans<<endl;
}