#include <bits/stdc++.h>
using namespace std;
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  ;
  int n;
  cin >> n;
  int a[n], b[n];
  int r1 = 0, r2 = 0;
  for (int i = 0; i < n; i++) {
    cin >> a[i];
    r1 |= a[i];
  }
  for (int i = 0; i < n; i++) {
    cin >> a[i];
    r2 |= a[i];
  }
  cout << r1 + r2 << endl;
  return 0;
}
