#include <iostream>
#include <vector>
#include <map>
#include <queue>
using namespace std;
struct Struct{
        int count,level;
        bool operator<(const Struct &other)const{
                if(level==other.level)
                        return count>other.count;
                else
                        return level>other.level;
        }
};
int main(){
        int N;
        cin >>N;
        vector <int>b;
        vector <Struct> a;
        priority_queue <Struct> aaa;
        for(int i=0 ; i<N ; i++ ){
                Struct x;cin >> x.level;
                x.count=0;
                a.push_back(x);
                aaa.push(x);
        }for(int i=0 ; i<N ; i++ ){
                int x;cin >> x;
                b.push_back(x/2);
        }
        int Max=2000000000;
        for(int i=0 ; i<N ; i++ ){
                priority_queue<Struct> now=aaa;
                int counter=0,tmax=0;
                while(counter!=N){
                        int l=(i+counter)%N;
                        Struct next;
                        next.level=now.top().level+b[l];
                        next.count=now.top().count+1;
                        now.pop();
                        now.push(next);
                        counter++;
                        if(tmax<next.count)tmax=next.count;
//                      if(Max<=tmax)break;
                }
//:w            cout << tmax << " "<<i << endl;
                if(Max>tmax)Max=tmax;
        }
        cout <<Max<<endl;
        return 0;
}