using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Text;
using System.Text.RegularExpressions;
using System.Linq;
using System.IO;

class Program
{ 
    static void Main(string[]args)
    {
        Magatro m = new Magatro();
        m.Scan();
        m.Solve();
    }
}

public class Magatro
{
    private PriortyQueue<Monstar> Q;
    private int N;
    private int[] B;
    public void Scan()
    {
        N = int.Parse(Console.ReadLine());
        Monstar[] a = Console.ReadLine().Split(' ').Select(s=>new Monstar(int.Parse(s))).ToArray();
        Array.Sort(a,Compare);
        Q = new PriortyQueue<Monstar>(Compare, a.ToList());
        B = Console.ReadLine().Split(' ').Select(int.Parse).ToArray();
    }
    public void Solve()
    {
        int ans = int.MaxValue;
        for(int i = 0; i < N; i++)
        {
            ans = Math.Min(ans, Cnt(i));
        }
        Console.WriteLine(ans);
    }

    private int Cnt(int first)
    {
        if (first < 0 || N <= first)
        {
            throw new IndexOutOfRangeException();
        }
        PriortyQueue<Monstar> cp = Q.Clone();
        for(int i = 0; i < N; i++)
        {
            Monstar mon = cp.Pop();
            mon.Battle++;
            mon.Level += B[(first + i) % N] / 2;
            cp.Push(mon);      
        }
        int max = -1;
        Monstar[] arr = cp.ToArray();
        for(int i = 0; i < N; i++)
        {
            max = Math.Max(max, arr[i].Battle);
        }
        return max;
    }
    private int Compare(Monstar a, Monstar b)
    {
        if (a.Level != b.Level)
        {
            return a.Level.CompareTo(b.Level);
        }
        else
        {
            return a.Battle.CompareTo(b.Battle);
        }
    }
}

public struct Monstar
{
    public int Battle;
    public int Level;
    public Monstar(int lebel)
    {
        Level = lebel;
        Battle = 0;
    }
}

public class PriortyQueue<T>
{
    private Comparison<T> Compare;    
    private List<T> L;
    public PriortyQueue(Comparison<T>compare)
    {
        Compare = compare;
        L = new List<T>();
    }
    public PriortyQueue(Comparison<T> compare, List<T>list) :this(compare)
    {
        L = list.ToList();
    }
    public void Push(T item)
    {
        if (L.Count == 0)
        {
            L.Add(item);
            return;
        }
        if (Compare(L[0], item) > 0)
        {
            L.Insert(0, item);
            return;
        }
        if (Compare(item, L.Last()) > 0)
        {
            L.Add(item);
            return;
        }

        int left = 0;
        int right = L.Count - 1;
        while (left != right)
        {
            int index = (left + right) / 2;
            switch (Compare(L[index], item))
            {
                case 1:
                    right = index;
                    break;
                case -1:
                    left = index+1;
                    break;
                case 0:
                    L.Insert(index, item);
                    return;
                default:
                    throw new Exception();
            }
        }
        L.Insert(right, item);
    }
    public T Peak()
    {
        if (L.Count < 1)
        {
            throw new IndexOutOfRangeException();
        }
        return L[0];
    }
    public T Pop()
    {
        T ret = Peak();
        L.RemoveAt(0);
        return ret;
    }
    public T[] ToArray()
    {
        return L.ToArray();
    }
    public PriortyQueue<T> Clone()
    {
        return new PriortyQueue<T>(Compare, L);
    }
}