#include "bits/stdc++.h"
using namespace std;
typedef long long ll;
#define rep(i,l,r) for(ll i=(l);i<(r);i++)
#define INF (ll)1e18
struct aaa{aaa(){cin.tie(0); ios::sync_with_stdio(0); cout<<fixed<<setprecision(10);};}aaaaaaa;
inline void in() {}
template <class Head, class... Tail>
inline void in(Head&& head,Tail&&... tail){
    cin>>head;
    in(move(tail)...);
}
template <class T>
inline void out(T t) {
    cout<<t<<'\n';
}
template <class Head, class... Tail>
inline void out(Head head,Tail... tail){
    cout<<head<<' ';
    out(move(tail)...);
}

int main(){
    string s;
    ll ans=0,m,n;
    cin>>m>>n;
    rep(i,0,n){
        cin>>s;
        rep(j,0,m)if(s[j]=='W')ans++;
    }
    cout<<ans;
}