#include <bits/stdc++.h>

using namespace std;

int main() {
    int n, m;
    
    cin >> n >> m;
    
    string tmp;
    int ct = 0;
    for (int i = 0; i < n; i++) {
        cin >> tmp;
        for (int j = 0; j < m; j++) {
            if (tmp[j] == 'W') {
               ct++; 
            }
        }
    }
    
    cout << ct << endl;
    
    return 0;
}