using System;
using System.Collections.Generic;
using System.Linq;
using System.IO;
using System.Text;
using static System.Math;
using static System.Array;
using static AtCoder.Tool;
namespace AtCoder
{
    class AC
    {
        const int MOD = 1000000007;
        const int INF = int.MaxValue / 2;
        const long SINF = long.MaxValue / 2;
        const double EPS = 1e-8;
        static readonly int[] dI = { 0, 1, 0, -1 };
        static readonly int[] dJ = { 1, 0, -1, 0 };
        //static List<List<int>> G = new List<List<int>>();
        //static List<List<Edge>>G = new List<List<Edge>>();
        //static List<Edge> E = new List<Edge>();
        static void Main(string[] args)
        {
            //var sw = new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false };
            //Console.SetOut(sw);
            var cin = new Scanner();

            var input = cin.ReadSplitInt();
            int N = input[0];
            int M = input[1];
            var a = cin.ReadSplitLong();
            Func<long, int> num = (aa) =>
            {
                int ret = 0;
                long k = aa;
                while (k % 2 == 0)
                {
                    ret++;
                    k /= 2;
                }
                return ret;
            };
            var ok = true;
            long s = num(a[0]);
            for(var i = 0; i < N; i++)
            {
                ok &= num(a[i]) == s;
            }
            if (!ok) { Console.WriteLine(0);return; }

            long lcm = a[0];

            for(var i = 1; i < N; i++)
            {
                lcm = Lcm(lcm, a[i]);
            }
            
            lcm /= 2;

            Func<long, long> f = (Mx) =>
            {
                long c = Mx / lcm;
                long b = Mx / (lcm * 2);
                //Console.WriteLine($"{b} {c}");
                return c - b;
            };
            long Lim = (a.Max() + 1) / 2;
            Console.WriteLine(Max(0, f(M) - f(Lim - 1)));
            


            

            //Console.Out.Flush();
        }
        public static long Lcm(long a, long b)
        {
            return a * b / Gcd(a, b);
        }

        
        public static long Gcd(long a, long b)
        {
            if (a < b)
                
                return Gcd(b, a);
            while (b != 0)
            {
                var remainder = a % b;
                a = b;
                b = remainder;
            }
            return a;
        }
        struct Edge
        {
            public int from;

            public int to;
            public long dist;
            public Edge(int t, long c)
            {
                from = -1;
                to = t;
                dist = c;
            }
            public Edge(int f, int t, long c)
            {
                from = f;
                to = t;
                dist = c;
            }

        }
    }
    
    public class Scanner
    {
        public int[] ReadSplitInt()
        {
            return ConvertAll(Console.ReadLine().Split(), int.Parse);
        }
        public long[] ReadSplitLong()
        {
            return ConvertAll(Console.ReadLine().Split(), long.Parse);
        }
        public double[] ReadSplit_Double()
        {
            return ConvertAll(Console.ReadLine().Split(), double.Parse);
        }
    }
    public static class Tool
    {
        static public void Initialize<T>(ref T[] array, T initialvalue)
        {
            for (var i = 0; i < array.Length; i++)
            {
                array[i] = initialvalue;
            }
        }
        static public void Swap<T>(ref T a, ref T b)
        {
            T keep = a;
            a = b;
            b = keep;
        }

        static public void Display<T>(T[,] array2d, int n, int m)
        {
            for (var i = 0; i < n; i++)
            {
                for (var j = 0; j < m; j++)
                {
                    Console.Write($"{array2d[i, j]} ");
                }
                Console.WriteLine();
            }
        }

        static public long LPow(int a, int b)
        {
            return (long)Pow(a, b);
        }
    }
}


Measured memory_bytes: 27612