#include<bits/stdc++.h>
typedef long long ll;
#define REP(i,n) for(int i = 0;i < (n);i++)
#define rep(i,m,n) for(int i = (m);i < (n);i++)
#define P pair<int,int>
#define pb push_back
#define mk make_pair
using namespace std;
#define Vec(a) vector <int> a
const int INF = 1 << 20;
const int MOD = 1e9+7;





int main(){
    int n,m;
    cin >> n >> m;

    string s[n];
    int cnt = 0;
    REP(i,n){
        cin >> s[i];
        REP(j,m){
            if(s[i][j] == 'W'){
                cnt++;
            }
        }
    }
    cout << cnt << endl;
  return 0;
}