#include <bits/stdc++.h>


#define ll long long
#define flt double
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()


using namespace std;

const ll inf = 1e18;
mt19937 rnd(234);


int32_t main() {
    if (1) {
        ios::sync_with_stdio(0);
        cin.tie(0);
        cout.tie(0);
    }
    int n;
    cin >> n;
    vector<ll> a(n), b(n);
    for (int i = 0; i < n; i += 1) {
        cin >> a[i];
    }
    for (int i = 0; i < n; i += 1) {
        cin >> b[i];
    }
    ll rs = -1;
    for (int k = 0; k < 30; k += 1) {
        ll l = 0;
        ll r = inf;
        for (int i = 0; i < n; i += 1) {
            l = max(l, (b[i] << k) - a[i]);
            r = min(r, (b[i] << k) - a[i] + (1ll << k) - 1);
        }
        if (l > r) {
            continue;
        }
        auto relax = [&](ll x) {
            ll val = (x >> k) + __popcount(x & ((1ll << k) - 1)) + k;
            if (rs == -1 or val < rs) {
                rs = val;
            }
            };
        while (l <= r) {
            relax(l);
            ll dl = l - (l & (l - 1));
            l += dl;
        }
    }
    cout << rs << "\n";
    return 0;
}

/*
5
1 2 3 4 5
6 6 6 6 7


3
2 3 4
1 2 3


2
65536 65537
1 2

*/