#include<bits/stdc++.h>
using namespace std;
#define int long long
#define f first
#define s second

signed main() {
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
  int tt = 1;
  //cin >> tt;
  while (tt--) {
		int n;
		cin >> n;
		vector<int> a(n), b(n);
		for (int i = 0;i < n;i++)
			cin >> a[i];
		for (int i = 0;i < n;i++)
			cin >> b[i];
		const int k = 30;
		int ans = 1e18;
		for (int i = 0;i < k;i++) {
			int l = 0, r = 1e18;
			for (int j = 0;j < n;j++) {
				l = max(l, b[j] * (1ll << i) - a[j]);
				r = min(r, b[j] * (1ll << i) + (1ll << i) - 1 - a[j]);
			}
			while (l <= r) {
				int y = (l >> i);
				int x = __builtin_popcount(l & ((1 << i) - 1));
				ans = min(ans, y + x + i);
				if (ans == 0)
					break;
				l += (l & -l);
			}
		}
		if (ans == 1e18)
			ans = -1;
		cout << ans;
  }
  return 0;
}