#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <iomanip>
#include <stack>
#include <algorithm>
#include <string>
#include <map>
#include <iterator>
#include <set>
#include <queue>
#include <bitset>
#include <cassert>

using namespace std;


int main() {

    int N, M;
    cin >> N >> M;
    int result = 0;
    for (int i = 0; i < N; ++i) {
        string A;
        cin >> A;
        result += count(A.begin(), A.end(), 'W');
    }
    cout << result << endl;
    return 0;
}