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

int main() {
    ll N;
    cin >> N;
    vector<string> S(N);
    for (ll i = 0; i < N; ++i) {
        cin >> S[i];
    }
    ll white_cnt = 0, cost_i = 0;
    for (ll i = 0; i < N; ++i) {
        cost_i += abs(white_cnt - i * N);
        for (ll j = 0; j < 2 * N; ++j) {
            if (S[i][j] == '.') {
                ++white_cnt;
            }
        }
    }
    ll white_j_sum = 0;
    for (ll i = 0; i < N; ++i) {
        for (ll j = 0; j < 2 * N; ++j) {
            if (S[i][j] == '.') {
                white_j_sum += j;
            }
        }
    }
    ll cost_j = white_j_sum - N * N * (N - 1) / 2;
    cout << cost_i + cost_j << endl;
}