using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication3
{
    public class Program
    {
        static void Main(string[] args)
        {
            new Program().Main2(Console.In, Console.Out);
        }

        public void Main2(TextReader reader, TextWriter writer)
        {
            var sum = int.Parse(reader.ReadLine().Split()[1]);
            var progression = reader.ReadLine().Split().Select(x => int.Parse(x)).ToList();
            var combinationNum = 0;
            foreach(var num in progression)
            {
                if (num >= sum) continue;
                var another = Math.Abs(sum - num);
                var anotherList = progression.FindAll(n => n == another);
                combinationNum += anotherList.Count;
            }
            writer.WriteLine(combinationNum);
        }
    }
}