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

int main() {

    int N;
    cin >> N;

    vector<string> S(N);

    for (int i = 0; i < N; i++) {
        cin >> S.at(i);
    }

    ll h = 0;

    vector<int> d(N, 0);

    for (int i = 0; i < N; i++) {

        int left_black = 0;
        int right_white = 0;

        for (int j = 0; j < N; j++) {
            if (S.at(i).at(j) == '#') {
                left_black++;
                h -= (j + 1);
            }
        }

        for (int j = N; j < 2 * N; j++) {
            if (S.at(i).at(j) == '.') {
                right_white++;
                h += (j + 1);
            }
        }

        d.at(i) = left_black - right_white;
    }

    ll v = 0;
    ll pref = 0;

    for (int i = 0; i < N - 1; i++) {
        pref += d.at(i);
        v += abs(pref);
    }

    cout << h + v << '\n';
}