#include <bits/stdc++.h>

using namespace std;

int main()
{
	int n, m;
	cin >> n >> m;
	vector<string> s(n);
	for (int i = 0; i < n; ++i) {
		cin >> s[i];
	}
	int ans = 0;
	for (int i = 0; i < n; ++i) {
		if (s[i] == string(m, 'x')) continue;
		bool flag = true;
		for (int j = 0; j < n; ++j) {
			if (i == j) continue;
			for (int k = 0; k < m; ++k) {
				if (s[i][k] == 'o' && s[j][k] == 'o') {
					flag = false;
                    break;
				}
			}
            if (!flag) break;
		}
		if (flag) ans++;
	}
	cout << ans << endl;
}