using System;
using System.Linq;

namespace No
{
    class MainClass
    {
        static int n;
        static int[] a;
        static int[] b;

        public static void Main(string[] args)
        {
            n = int.Parse(Console.ReadLine());
            a = Console.ReadLine().Split(' ').Select(x => int.Parse(x)).ToArray();
            b = Console.ReadLine().Split(' ').Select(x => int.Parse(x)).ToArray();

            int max_battle_number = n;

            for (int start = 0; start < n; start++)
            {
                int[] level = new int[n];
                int pos = start, count = 0, max = 0;

                for (int i = 0; i < n; i++)
                    level[i] = a[i] * 1000;

                while (true)
                {
                    level[Array.IndexOf(level, level.Min())] += (b[pos] / 2) * 1000 + 1;

                    pos++;
                    if (pos >= n)
                        pos = 0;

                    count++;
                    if (count == n)
                        break;
                }

                foreach (int num in level)
                    if (max < num % 1000)
                        max = num % 1000;

                if (max_battle_number > max)
                    max_battle_number = max;
            }

            Console.WriteLine(max_battle_number);
        }
    }
}