using System;
using System.Collections.Generic;

public class Program
{
    public void Proc() {
        Reader.IsDebug = false;
        int cnt = int.Parse(Reader.ReadLine());
        
        int[] inpt = Reader.GetInt();
        for(int i=0; i<inpt.Length; i++) {
            Mikata m = new Mikata();
            m.Count = 0;
            m.Level = inpt[i];
            this.MikataList.Add(m);
        }
        this.MikataList.Sort((a,b)=>{ return (a.Level < b.Level)?-1:((a.Level > b.Level)?1:0); });
        inpt = Reader.GetInt();
        List<int> tekiOriginal = new List<int>();
        tekiOriginal.AddRange(inpt);
        
        int ans = int.MaxValue;
                
        for(int i=0; i<inpt.Length; i++) {
            int[] tekiArray = new int[tekiOriginal.Count];
            List<Mikata> tmpMikata = new List<Mikata>();
            tmpMikata.AddRange(this.MikataList);
            tekiOriginal.CopyTo(i, tekiArray, 0, tekiOriginal.Count - i);
            if(i > 0) {
                tekiOriginal.CopyTo(0, tekiArray, tekiOriginal.Count - i, i);
            }
            int maxCount = 0;
            for(int j=0; j<tekiArray.Length; j++) {
                Mikata m = tmpMikata[0];
                tmpMikata.RemoveAt(0);
                m.Level += (tekiArray[j] / 2);
                m.Count++;
                maxCount = Math.Max(maxCount, m.Count);
                int idx = this.FindIndex(tmpMikata, m, 0, tmpMikata.Count - 1);
                tmpMikata.Insert(idx, m);
            }
            ans = Math.Min(ans, maxCount);
        }
        Console.WriteLine(ans);

    }
    
    
    private int FindIndex(List<Mikata> list, Mikata el, int startIdx, int endIdx) {
        if(Compair(el, list[startIdx]) <= 0) {
            return startIdx;
        }
        if(Compair(el, list[endIdx]) >= 0) {
            return endIdx + 1;
        }
        if(endIdx - startIdx <= 1) {
            return endIdx;
        }
        int mid = (startIdx + endIdx) / 2;
        int tmp = Compair(el, list[mid]);
        if(tmp < 0) {
            return this.FindIndex(list, el, startIdx, mid - 1);
        } else if(tmp > 0) {
            return this.FindIndex(list, el, mid, endIdx);
        }
        return mid;
    }
    
    private int Compair(Mikata a, Mikata b) {
        if(a.Level < b.Level) {
            return -1;
        }
        if(a.Level > b.Level) {
            return 1;
        }
        if(a.Count < b.Count) {
            return -1;
        }
        if(a.Count > b.Count) {
            return 1;
        }
        return 0;
    }

    private List<Mikata> MikataList = new List<Mikata>();
    
    public struct Mikata {
        public int Level;
        public int Count;
    }

    public class Reader {
        private static String InitText = @"






        ";
        
        private static System.IO.StringReader sr = null;
        
        public static bool IsDebug = true;
        
        public static string ReadLine() {
            if(IsDebug) {
                if(sr == null) {
                    sr = new System.IO.StringReader(InitText.Trim());
                }
                return sr.ReadLine();
            } else {
                return Console.ReadLine();
            }
        }
        public static int[] GetInt(char delimiter = ' ') {
            string[] inpt = ReadLine().Split(delimiter);
            int[] ret = new int[inpt.Length];
            for(int i=0; i<inpt.Length; i++) {
                ret[i] = int.Parse(inpt[i]);
            }
            return ret;
        }
    }
    public static void Main(string[] args)
    {
        Program prg = new Program();
        prg.Proc();
    }
}