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

using lint = long long;

int main() {
    int n;
    cin >> n;
    vector<vector<char>> s(n, vector<char>(n));
    rep(i, n) {
        rep(j, n) {
            cin >> s[i][j];
        }
    }
    rep(j, n) {
        if (s[0][j] == '-') {
            s[0][j] = 'o';
            s[j][0] = 'x';
        }
    }
    vector<int> cnt(n, 0);
    rep(i, n) {
        rep(j, n) {
            if (s[i][j] == 'o') {
                cnt[i]++;
            }
        }
    }
    rep(i, n) {
        rep(j, n) {
            if (s[i][j] == '-') {
                if (cnt[i] <= cnt[j]) {
                    s[i][j] = 'o';
                    s[j][i] = 'x';
                    cnt[i]++;
                } else {
                    s[i][j] = 'x';
                    s[j][i] = 'o';
                    cnt[j]++;
                }
            }
        }
    }
    vector<vector<int>> v(100);
    rep(i, n) {
        v[cnt[i]].emplace_back(i);
    }
    int ans = 1;
    for (int i = 99; i >= 0; i--) {
        for (auto x : v[i]) {
            if (x == 0) {
                cout << ans << endl;
                return 0;
            }
        }
        if (v[i].size() > 0) {
            ans++;
        }
    }
}