#include <bits/stdc++.h>

using namespace std;

#define ll long long
const int INF=1e9,MOD=1e9+7;
const ll LINF=1e18;
#define fi first
#define se second
#define pii pair<int,int>
#define mid ((l+r)/2)
#define sz(a) (int((a).size()))
#define all(a) a.begin(),a.end()
//#define endl "\n"
#define pb push_back

void PRINT(int x) {cerr << x;}
void PRINT(ll x) {cerr << x;}
void PRINT(double x) {cerr << x;}
void PRINT(char x) {cerr << '\'' << x << '\'';}
void PRINT(string x) {cerr << '\"' << x << '\"';}
void PRINT(bool x) {cerr << (x ? "true" : "false");}

template<typename T,typename V>
void PRINT(pair<T,V>& x){
    cerr<<"{";
    PRINT(x.fi);
    cerr<<",";
    PRINT(x.se);
    cerr<<"}";
}
template<typename T>
void PRINT(T &x){
    int id=0;
    cerr<<"{";
    for(auto _i:x){
        cerr<<(id++ ? "," : "");
        PRINT(_i);
    }
    cerr<<"}";
}
void _PRINT(){
    cerr<<"]\n";
}
template<typename Head,typename... Tail>
void _PRINT(Head h,Tail... t){
    PRINT(h);
    if(sizeof...(t)) cerr<<", ";
    _PRINT(t...);
}

#define Debug(x...) cerr<<"["<<#x<<"]=["; _PRINT(x)

void Solve(){
    int N; cin>>N;
    vector<ll> a(N+1),b(N+1);
    for(int i=1;i<=N;i++) cin>>a[i];
    for(int i=1;i<=N;i++) cin>>b[i];
    ll res=1e18;
    for(ll k=0;k<=30;k++){
        ll L=0,R=1e18;
        for(int i=1;i<=N;i++){
            L=max(L,b[i]*(1<<k)-a[i]);
            R=min(R,b[i]*(1<<k)+(1<<k)-a[i]-1);
        }
        if(L>R) continue;
        if(L==0) res=min(res,k);
        while(L<=R){
            res=min(res,(L>>k)+__builtin_popcount(L&((1<<k)-1))+k);
            L+=L&-L;
        }
    }
    cout<<(res==1e18 ? -1 : res)<<endl;
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int t; t=1;
    //cin>>t;
    while(t--){
        Solve();
    }
    return 0;
}