import java.util.*;
import java.io.*;
public class No009 {


    public static void main(String[] args) throws IOException {

        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        int n=Integer.parseInt(br.readLine());
        int[] a=new int[n];
        int[] b=new int[n];
        StringTokenizer st=new StringTokenizer(br.readLine());
        for(int i=0;i<n;i++){ a[i]=Integer.parseInt(st.nextToken()); }
        st=new StringTokenizer(br.readLine());
        for(int i=0;i<n;i++){ b[i]=Integer.parseInt(st.nextToken())/2; }
        int max=0;
        int min=1000000000;
        for(int i=0;i<n;i++){
            Queue<zako> q=new PriorityQueue(new my());
            for(int nn:a){ q.add(new zako(nn,0));  }
            max=0;
            for(int j=i;j<n+i;j++){
                zako z=q.poll();
                z.level+=b[i%n];
                z.times++;
                if(z.times>min) break;
                if(z.times>max) max=z.times;
                q.add(z);
            }min=Math.min(min,max);
        }System.out.println(min);
    }
    
}

class my implements Comparator{
    public int compare(Object obj1,Object obj2){
        zako z1=(zako)obj1;
        zako z2=(zako)obj2;
        
        if(z1.times+z1.level*100000>z2.times+z2.level*100000){
            return 1;
        }else if(z1.times+z1.level*100000<z2.times+z2.level*100000){
            return -1;
        }else{
            return 0;
        }
    }
}

class zako{
    int level;
    int times;
    zako(int level,int times){
        this.level=level;
        this.times=times;
    }
}