#include <bits/extc++.h>

int main() {
  using namespace std;
  cin.tie(nullptr)->sync_with_stdio(false);
  int n;
  cin >> n;
  vector<int> a(n), b(n);
  for (auto&& e : a) cin >> e;
  for (auto&& e : b) cin >> e;
  int a2 = count(begin(a), end(a), 2);
  int b2 = count(begin(b), end(b), 2);
  int res{};
  if (a2 and b2) {
    res = (a2 + b2) * n - a2 * b2;
  } else if (a2 == 0 and b2 == 0) {
    res = max(count(begin(a), end(a), 1), count(begin(b), end(b), 1));
  } else {
    if (b2) {
      swap(a2, b2);
      swap(a, b);
    }
    assert(a2 and b2 == 0);
    assert(count(begin(b), end(b), 1) == n);
    res = a2 * n + count(begin(a), end(a), 1);
  }
  cout << res << '\n';
}