#include <iostream>
#include <vector>
#include <map>
#include <string>
#include <utility>
#include <queue>
#include <stack>
#include <cmath>
#include <numeric>

#define rep(i,j,k) for(int i=(int)j;i<(int)k;i++)
#define ll long long
using namespace std;
int day[12]={31,28,31,30,31,30,31,31,30,31,30,31};
int main(){
    int h,w;
    cin>>h>>w;
    int ans=0;
    rep(i,0,h)rep(j,0,w){
        char c;
        cin>>c;
        if(c=='W')ans++;
    }
    cout<<ans<<endl;
}