package net.ipipip0129.yukicoder.No723;

import java.util.Arrays;
import java.util.Scanner;

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];

        int ans_cnt = 0;

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

        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) {
                for (int j = i; j < num_len; j++) {
                    if (sub == num_array[j]) {
                        if (i == j) ans_cnt += 1;
                        else ans_cnt += 2;
                    } else if (sub < num_array[j]) {
                        break;
                    }
                }
            }
        }

        System.out.println(ans_cnt);
    }
}