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

#define rep(i, a, b) for (ll i = a; i < b; i++)
using ll = long long;

int main(){
    int n, m;
    cin >> n >> m;
    vector<string> s(n);
    rep(i, 0, n) cin >> s[i];
    int ans = 0;
    rep(i, 0, n) {
        int f = 0;
        rep(j, 0, m) {
            if(s[i][j] == 'o') {
                f = 1;
                int cnt = 0;
                rep(k, 0, n) {
                    if(s[k][j] == 'o') cnt++;
                    if(cnt > 1) {
                        f = -1;
                        break;
                    }
                }
                if(f < 0) break;
            }
        }
        if(f == 1) ans++;
    }
    cout << ans << endl;
}