#include <iostream>
#include <algorithm>
#include <functional>
#include <string>
#include <limits.h>
using namespace std;

const int Max_monster = 1500;
const int Max_lv = 80000;
const int Max_ans = 80;

int save[Max_monster];
int my[Max_ans][Max_lv] = {0};	//lv1 → 位置0
int com[Max_monster];


int main(){
	int n;
	int in;
	int ans = 999;
	int ansmax;
	cin >> n;
	for(int i=0; i<n; i++){
		cin >> save[i];
	}
	
	for(int i=0; i<n; i++){
		cin >> com[i];
	}
	
	//計算部分
	for(int starti=0; starti<n; starti++){
		//cout << "-----" << starti << "-----" << endl;
		//my表作成
		for(int i=0; i<Max_ans; i++){
			for(int j=0; j<Max_lv; j++){
				my[i][j] = 0;
			}
		}
		for(int i=0;i<Max_monster; i++){
			my[0][ save[i] - 1] ++;
		}
		
		//戦闘
		int i=starti;
		int lvnow = 0;
		int ansnow = 0;
		int ansmax = -1;
		do{
			//次に戦う味方を探す
			while(my[ansnow][lvnow] == 0){
				ansnow ++;
				if(ansnow >= Max_ans){
					lvnow ++;	//注意
					ansnow = 0;
				}
			}
			
			//LVUP
			my[ansnow][lvnow] --;
			my[ansnow + 1][lvnow + com[i]/2] ++;
			if(ansnow + 1 > ansmax){
				ansmax = ansnow + 1;
			}
			//cout << "戦闘" << ansnow << "→" << ansnow+1 << "\tLV" << lvnow << "→" << lvnow + com[i]/2 << endl;
			
			//next
			i ++;
			if(i >= n){
				i=0;
			}
		}while(i != starti);
		
		//答え更新
		if(ansmax < ans){
			ans = ansmax;
		}
	}
	
	cout << ans << endl;
	
	return 0;
}