#include <bits/stdc++.h>
using namespace std;
int board[207][207];
int piece[4][107][107];
char st[107];
int main() {
  int n;
  scanf("%d", &n);
  for (int k = 0; k < 4; ++k)
    for (int i = 0; i < n; ++i) {
      scanf("%s", st);
      for (int j = 0; j < n; ++j) piece[k][i][j] = st[j] - '0';
    }
  int ans = 4 * n * n;
  for (int p0 = 0; p0 < 4; ++p0)
    for (int p1 = 0; p1 < 4; ++p1)
      for (int p2 = 0; p2 < 4; ++p2)
        for (int p3 = 0; p3 < 4; ++p3) {
          if (p0 == p1 || p0 == p2 || p0 == p3) continue;
          if (p1 == p2 || p1 == p3) continue;
          if (p2 == p3) continue;
          for (int i = 0; i < n; ++i)
            for (int j = 0; j < n; ++j) {
              board[i][j] = piece[p0][i][j];
              board[i][j + n] = piece[p1][i][j];
              board[i + n][j] = piece[p2][i][j];
              board[i + n][j + n] = piece[p3][i][j];
            }
          int cnt0 = 0, cnt1 = 0;
          for (int i = 0; i < 2 * n; ++i)
            for (int j = 0; j < 2 * n; ++j) {
              if ((i + j) % 2 == 0) {
                cnt0 += board[i][j];
                cnt1 += 1 - board[i][j];
              }
              if ((i + j) % 2 == 1) {
                cnt0 += 1 - board[i][j];
                cnt1 += board[i][j];
              }
            }
          ans = min(ans, cnt0);
          ans = min(ans, cnt1);
        }
  printf("%d\n", ans);
  return 0;
}
