#include <iostream>
#include <vector>
#include <string>

using namespace std;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int N, M;
    if (!(cin >> N >> M)) return 0;

    vector<string> S(N);
    for (int i = 0; i < N; ++i) {
        cin >> S[i];
    }

    int unique_ticket_count = 0;

    for (int i = 0; i < N; ++i) {
        bool is_unique = true;
        bool has_event = false;

        for (int j = 0; j < M; ++j) {
            if (S[i][j] == 'o') {
                has_event = true;
            }
            
            for (int k = 0; k < N; ++k) {
                if (i != k && S[i][j] == 'o' && S[k][j] == 'o') {
                    is_unique = false;
                }
            }
        }

        if (has_event && is_unique) {
            unique_ticket_count++;
        }
    }

    cout << unique_ticket_count << '\n';

    return 0;
}