After Lunch Fun 2

using System;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("ANSWER --- Output Value: {0}", lowPosNotIn(new int[] { 1, 3, 6, 4, 1, 2 }));
            Console.WriteLine("ANSWER --- Output Value: {0}", lowPosNotIn(new int[] { 1, 2, 3 }));
            Console.WriteLine("ANSWER --- Output Value: {0}", lowPosNotIn(new int[] { -1, -3 }));
            Console.WriteLine("ANSWER --- Output Value: {0}", lowPosNotIn(new int[] { 1, -8, 3, 888, 6, -4, 1, 2, 3, 4, 5, 7, 8, 9, 10, 1024, 65536, 1  }));
            Console.ReadLine();
        }
        private static int lowPosNotIn(int[] arrIN)
        {
            Array.Sort(arrIN);
            int lowPositive = 1;
            foreach(int i in arrIN)
            {
                    if (((i > lowPositive || lowPositive > i) != true) && (i>0))
                    {
                        lowPositive++;
                    }
            }
            return lowPositive;
        }
    }

}