import java.util.*;
import java.util.stream.*;
import static java.lang.Math.*;
public class Main{
	public static void main(String... args){
		Scanner sc=new Scanner(System.in);
		int n=sc.nextInt();
		int[] a=new int[n];
		for(int i=0;i<n;i++){
			a[i]=sc.nextInt();
		}
		int[] b=new int[n];
		for(int i=0;i<n;i++){
			b[i]=sc.nextInt();
		}
		int min=Integer.MAX_VALUE;
		for(int s=0;s<n;s++){
			PriorityQueue<Pair> pq=new PriorityQueue<>(Comparator.comparingInt((Pair p)->p.x).thenComparingInt(p->p.y));
			for(int i=0;i<n;i++){
				pq.add(new Pair(a[i],0));
			}
			for(int j=0;j<n;j++){
				int index=(s+j)%n;
				Pair p=pq.poll();
				p.x+=b[index]/2;
				p.y++;
				pq.add(p);
			}
			int max=Integer.MIN_VALUE;
			while(pq.size()>0){
				max=max(max,pq.poll().y);
			}
			min=min(min,max);
		}
		put(min);
	}
	public static class Pair{
		int x,y;
		Pair(int x,int y){
			this.x=x;
			this.y=y;
		}
		@Override
		public String toString(){
			return String.format("Pair(%d,%d)",x,y);
		}
	}
	public static void print(Object object){
        System.out.print(object);
    }
    public static void put(Object object) {
        System.out.println(object);
    }
    public static void put(){
        System.out.println();
    }
 
    public static void print(String format,Object... args){
        System.out.print(String.format(format,args));
    }
    public static void put(String format,Object... args) {
        System.out.println(String.format(format,args));
    }
}