#include <bits/stdc++.h>
#define rep(i,l,r) for(int i=l; i<=r; i++)
#define per(i,r,l) for(int i=r; i>=l; i--)
#define IOS {cin.tie(0);cout.tie(0);ios::sync_with_stdio(0);}
using namespace std;
typedef long long ll;
typedef pair<int,int> P;
#define pll pair<ll,ll>
const int N=1e6+6;
const ll inf=4e18;
int a[N],b[N];
pll q[N];
int main() {
    IOS
    int n;cin>>n;
    rep(i,1,n)cin>>a[i];
    rep(i,1,n)cin>>b[i];
    ll ans=inf;
    rep(j,0,31){
        ll pw=1ll<<j;
        ll l=b[1]*pw,r=b[1]*pw+pw-1;
        rep(i,2,n){
            ll li=b[i]*pw,ri=b[i]*pw+pw-1;
            li-=a[i]-a[1]; ri-=a[i]-a[1];
            l=max(l,li); r=min(r,ri);
            if(l>r)break;
        }
        // cout<<j<<' '<<l<<' '<<r<<'\n';
        auto cal=[&](ll x){
            // cout<<x<<'\n';
            if(x>pw*b[1])return x-pw*b[1];
            ll res=x/pw; res+=__builtin_popcountll(x%pw); return res;
        };
        if(l<=r){
            if(r>=a[1]){
                ans=min(ans,cal(max(0ll,l-a[1]))+j); break;
            }
        }
    }
    if(ans==inf)cout<<"-1\n";
    else cout<<ans<<'\n';
}
/*
5
1 2 3 4 5
6 6 6 6 7
*/