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(x => int.Parse(x)).ToArray();
            Array.Sort(a);
            var sum = 0;
            foreach(var m in a)
            {
                sum += a.Where(value => value + m == x).Count();
            }
            Console.WriteLine(sum);
        }
    }
}