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

int main(){
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n; cin >> n;
  vector<string> s(n);
  for(auto &&e: s) cin >> e;
  
  vector<pair<int, int>> l, r;
  for(int i = 0; i < n; ++i){
    for(int j = 0; j < n; ++j){
      if(s[i][j] == '#') l.emplace_back(make_pair(i, j));
    }
    for(int j = n; j < n*2; ++j){
      if(s[i][j] == '.') r.emplace_back(make_pair(i, j));
    }
  }
  int z = 0, ls = l.size();
  for(int i = 0; i < ls; ++i){
    auto [lx, ly] = l[i];
    auto [rx, ry] = r[i];
    z += (rx - lx) + (ry - ly);
  }
  cout << z << '\n';
  return 0;
}