#include<bits/stdc++.h>
#define rep(i,a,b) for(int i=int(a);i<int(b);++i)
using namespace std;
typedef long long ll;
int INF = (1LL << 30) - 1;
int MOD = 1e9+7;
main(){
    int H,W,cnt = 0;
    cin >> H >> W;
    rep(i,0,H){
        string S;
        cin >> S;
        rep(j,0,W){
            if(S[j] == 'W')cnt++;
        }
    }
    cout << cnt << endl;
}