using System.Collections.Generic;
using System;

public class Hello
{
    static void Main()
    {
        var d = new Dictionary<int, int>();
        string[] line = Console.ReadLine().Trim().Split(' ');
        var n = int.Parse(line[0]);
        var x = int.Parse(line[1]);
        for (int i = 0; i < n; i++)
        {
            var w = int.Parse(Console.ReadLine().Trim());
            if (d.ContainsKey(w)) d[w]++;
            else d[w] = 1;
        }
        Console.WriteLine(x == 0 ? case0(d) : caseNz(x, d));
    }
    static long caseNz(int x, Dictionary<int, int> d)
    {
        var res = 0L;
        foreach(var y in d)
        {
            var t = y.Key ^ x;
            if (d.ContainsKey(t)) res += (long)y.Value * d[t];
        }
        return res / 2;
    }
    static long case0(Dictionary<int, int> d)
    {
        var res = 0L;
        foreach (var x in d)
            if (x.Value >= 2) res += (long)x.Value * (x.Value - 1) / 2;
        return res;
    }
}