#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)

int main() {
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);
    int n, m;
    cin >> n >> m;
    vector<string> s(n);
    rep(i, n) cin >> s[i];
    int ans = 0;
    rep(i, n) {
        bool ok1 = true;
        bool ok2 = false;
        rep(j, m) {
            if (s[i][j] == 'o') {
                ok2 = true;
                int c = 0;
                rep(k, n) {
                    if (s[k][j] == 'o')
                        c++;
                }
                if (c != 1)
                    ok1 = false;
            }
        }
        if (ok1 && ok2)
            ans++;
    }
    cout << ans << endl;
    return 0;
}