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

using i32 = int;
using i64 = long long;
using i128 = __int128_t;
using f64 = double;
using p2 = pair<i64, i64>;
using p3 = tuple<i64, i64, i64>;
using mint = atcoder::modint998244353;
constexpr i64 inf = 1e18;

void _main();
int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  cout << fixed << setprecision(18);
  _main();
}

void _main() {
  i64 n;
  cin >> n;
  vector<string> s(n);
  i64 ans = 0;
  vector<i64> cnt(n);
  for (i64 i = 0; i < n; i++) {
    cin >> s[i];
    i64 c = 0;
    for (i64 j = 0; j < 2 * n; j++) {
      if (s[i][j] == '#') {
        c++;
        continue;
      }
      if (j - c >= n) ans += j - n + 1;
      else ans += c;
      cnt[i]++;
    }
  }
  for (i64 i = 0; i < n; i++) {
    for (i64 j = 0; j < n; j++) {
      while (cnt[i] > n && cnt[j] < n) {
        ans += abs(j - i) + (n - cnt[j] - 1);
        cnt[i]--, cnt[j]++;
      }
    }
  }
  cout << ans << "\n";
}