using System;
using System.Collections.Generic;
using System.Linq;

namespace Problem1083
{
    class Program
    {
        static void Main(string[] args)
        {
            var buff = GetLongArray();
            long K = buff[1];
            var A = GetLongList();

            Console.WriteLine(Solver(K, A));

        }

        static long Solver (long k, List<long> list)
        {
            if (list.FindIndex(x => x <= k) == -1)
            {
                return k;
            }
            else
            {
                long temp = 0;
                long max = 0;
                for(int i = 0; i < list.Count; i++)
                {
                    if(list[i] <= k)
                    {
                        temp = Solver(k % list[i], list);
                        max = max < temp ? temp : max;
                    }
                }
                return max;
            }
        }

        public static int GetInt() => int.Parse(Console.ReadLine());
        public static int[] GetIntArray() => Console.ReadLine().Split().Select(int.Parse).ToArray();
        public static double GetDouble() => double.Parse(Console.ReadLine());
        public static double[] GetDoubleArray() => Console.ReadLine().Split().Select(double.Parse).ToArray();
        public static List<long> GetLongList() => Console.ReadLine().Split().Select(long.Parse).ToList();
        public static long[] GetLongArray() => Console.ReadLine().Split().Select(long.Parse).ToArray();

    }
}