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

using ll = long long;
using pii = pair<int, int>;
using vi = vector<int>;
using vll = vector<long long>;
using vvi = vector<vi>;
using vs = vector<string>;
using vc = vector<char>;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define all(a) (a).begin(), (a).end()
template<class T> using min_pq = priority_queue<T, vector<T>, greater<T>>;

const int INF = 1e9;
const ll LINF = 1e18;

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    
    int n;
    cin >> n;
    vs data(n);
    rep(i,n) cin >> data[i];
    vi wcnt(n,0);
    vi wt(n,0);
    ll ans=0;
    rep(i,n)rep(j,2*n){
        if(data[i][j]=='.') {
            wt[i]+=j-wcnt[i];
            ans+=j-wcnt[i];
            wcnt[i]++;
        }
    }
    vi mar(n,0);
    rep(i,n){
        mar[i]=wcnt[i]-n;
    }
    rep(i,n){
        while(mar[i]>0){
            rep(j,n){
                if(mar[j]<0){
                    ans+=abs(i-j);
                    ans+=mar[i]-mar[j]-1;
                    mar[j]++;
                    mar[i]--;
                    break;
                }
            }
        }
    }
    cout << ans << endl;


    
}