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

namespace yukicoder
{
    public class Program
    {
        public static void Main()
        {
            var line = Console.ReadLine().Split(' ');
            var n = int.Parse(line[0]);
            var x = int.Parse(line[1]);
            var a = Console.ReadLine().Split(' ').Select(value => int.Parse(value)).ToArray();
            var sum = 0;
            var c = new bool[n];
            var T = x % 2 == 0;
            Array.Sort(a);
            var t = 0;
            for(var i = 0; i < n; i++)
            {
                if ( T && a[i] == x / 2)
                {
                    t++;
                }
                else if(!c[i])
                {
                    for (var j = n - 1; j >= 0; j--)
                    {
                        if (a[i] + a[j] == x)
                        {
                            c[j] = true;
                            sum += 2;
                        }
                        else if (a[i] + a[j] < x)
                        {
                            break;
                        }
                    }
                }
                c[i] = true;
            }
            sum += t * t;
            Console.WriteLine(sum);
        }
    }
}