#include "bits/stdc++.h"
using namespace std;
#define fastcin {\
    cin.tie(0);\
    ios::sync_with_stdio(false);\
}
#define rep(i, a, b) for(int i = a; i < b; i++)
#define print(x) cout << x << "\n"

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