package net.ipipip0129.yukicoder.No723;

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);

        int num_len = scan.nextInt();
        int base_num = scan.nextInt();

        int[] num_array = new int[num_len];
        Map<Integer, List<Integer>> num_map = new HashMap<>();

        long ans_cnt = 0;

        for (int i = 0; i < num_len; i++) {
            int a = scan.nextInt();
            num_array[i] = a;

            List<Integer> li;
            if (num_map.containsKey(a)) li = num_map.get(a);
            else li = new ArrayList<>();
            li.add(i);
            num_map.put(a, li);
        }

        Arrays.sort(num_array);

        for (int i = 0; i < num_len; i++) {
            int sub = base_num - num_array[i];
            if (num_array[i] <= base_num) {
                if (num_map.containsKey(sub)) {
                    List<Integer> li = num_map.get(sub);
                    ans_cnt += li.size();
                }
            } else {
                break;
            }
        }

        System.out.println(ans_cnt);
    }
}