#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  long long n;
  cin >> n;
  vector<pair<long long, long long> > v;
  for (long long i = 1; i <= 4; i++) {
    string s[n];
    for (long long j = 0; j < n; j++) cin >> s[j];
    long long zero, one;
    long long temp = 0;
    char c = '1';
    for (long long j = 0; j < n; j++) {
      if (c == '1')
        c = '0';
      else
        c = '1';
      for (long long k = 0; k < n; k += 2) {
        if (k == 0 && s[j][k] != c) temp++;
        if ((k + 1) < n && s[j][k + 1] == c) temp++;
        if ((k + 2) < n && s[j][k + 2] != c) temp++;
      }
    }
    zero = temp;
    temp = 0;
    c = '0';
    for (long long j = 0; j < n; j++) {
      if (c == '1')
        c = '0';
      else
        c = '1';
      for (long long k = 0; k < n; k += 2) {
        if (k == 0 && s[j][k] != c) temp++;
        if ((k + 1) < n && s[j][k + 1] == c) temp++;
        if ((k + 2) < n && s[j][k + 2] != c) temp++;
      }
    }
    one = temp;
    v.push_back(make_pair(zero, one));
  }
  long long mini = 1e18;
  long long temp = v[0].first + v[1].first + v[2].second + v[3].second;
  mini = min(mini, temp);
  temp = v[0].first + v[2].first + v[1].second + v[3].second;
  mini = min(mini, temp);
  temp = v[0].first + v[3].first + v[1].second + v[2].second;
  mini = min(mini, temp);
  temp = v[0].second + v[1].second + v[2].first + v[3].first;
  mini = min(mini, temp);
  temp = v[0].second + v[2].second + v[1].first + v[3].first;
  mini = min(mini, temp);
  temp = v[0].second + v[3].second + v[1].first + v[2].first;
  mini = min(mini, temp);
  cout << mini << '\n';
  return 0;
}
