#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000001



int main(){
	int n;
	cin>>n;
	
	vector<int> a(n),b(n);
	rep(i,n)cin>>a[i];
	rep(i,n)cin>>b[i];
	int ans = Inf;
	rep(_,n){
		
		priority_queue<pair<int,int>,vector<pair<int,int>>,greater<pair<int,int>>> Q;
		rep(i,n)Q.emplace(a[i],0);
		
		rep(i,n){
			auto p = Q.top();
			Q.pop();
			p.second++;
			p.first += b[i]/2;
			Q.push(p);
		}
		int temp = 0;
		while(Q.size()>0){
			temp = max(temp,Q.top().second);
			Q.pop();
		}
		ans = min(ans,temp);
		
		b.push_back(b[0]);
		b.erase(b.begin());
	}
	cout<<ans<<endl;
	
	return 0;
}