using System;

namespace HelloWorld
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] array1 = { 2, 4, 3, 201, 1003, 1, 6, -20, 10000, -30, 10, 200303 };
            int[] array2 = { 10, -2, 1000, 5, -300, -200, -1000, 100, 7, 8, 9, 10000, -2042, 32021 };

            Array.Resize(ref array2, array2.Length + array1.Length);
            Array.Copy(array1, 0, array2, array1.Length, array1.Length);
            Array.Sort(array2);
            int x = 1;
            int lowestUnmatched = 0;
            foreach (int i in array2)
            {
                if (i < 1) continue;
                if (i != x)
                {
                    Console.WriteLine(x);
                    break;
                } else {
                    while (x <= 100000)
                    {
                        x = x + 1;
                        if (i != x)
                        {
                            if (lowestUnmatched == i)
                            {
                                Console.WriteLine(lowestUnmatched);
                                return;
                            }
                            lowestUnmatched = i;
                            break;
                        }

                    }
                }

            }
        }
    }
}