#include <bits/stdc++.h>
using namespace std;

int main(){
    int N, M;
    cin >> N >> M;
    vector<string> S(N);
    for (auto& s : S) cin >> s;

    int cnt = 0;
    for (int i = 0; i < N; i++){
        bool ok = count(S[i].begin(), S[i].end(), 'o');
        for (int j = 0; j < M; j++) if (S[i][j] == 'o'){
            bool okok = true;
            for (int k = 0; k < N; k++){
                if (k != i && S[k][j] == 'o') okok = false;
            }
            if (!okok) ok = false;
        }
        if (ok) cnt++;
    }

    cout << cnt << endl;
}