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;
            Array.Sort(A);
            var a = A.Where(value => value < x / 2).ToArray();
            var b = A.Where(value => value >= x / 2).ToArray();
            foreach(var m in a)
            {
                sum += b.Where(value => value + m == x).Count();
            }
            if (x % 2 == 0)
            {
                var k = b.Where(value => value == x / 2).Count();
                sum += k * k;
            }
            Console.WriteLine(sum);
        }
    }
}