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

#define rep(i, a, b) for(int i = a; i < b; i++)
using ll = long long;

int main(){
	int n;
	cin >> n;
	vector<string> s(n);
	rep(i, 0, n) cin >> s[i];
	vector<int> l, r;
	int n2 = n * 2;
	rep(i, 0, n) {
		rep(j, 0, n2) {
			if(s[i][j] == '#' && j < n) l.push_back(i * n2 + j);
			if(s[i][j] == '.' && j >= n) r.push_back(i * n2 + j);
		}
	}
	sort(l.begin(), l.end());
	sort(r.begin(), r.end());
	ll ans = 0;
	int sz = l.size();
	rep(i, 0, sz) {
		int ry = r[i] / n2;
		int rx = r[i] % n2;
		int ly = l[i] / n2;
		int lx = l[i] % n2;
		ans += abs(ry - ly) + abs(rx - lx);
	}
	cout << ans << endl;
}