package yukicoder.wa;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Scanner;
import java.util.Set;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int x = sc.nextInt();
		sc.nextLine();
		int count = 0;

		String[] a = sc.nextLine().split(" ");

		// System.out.println(Arrays.toString(a));

		int[] num = new int[n];

		Set<Integer> num_ = new HashSet<>();
		Map<Integer, Integer> countForNum = new HashMap<>();

		for (int i = 0; i < n; i++) {
			int j = Integer.parseInt(a[i]);
			num_.add(j);
			if (countForNum.get(j) != null) {
				countForNum.put(j, countForNum.get(j) + 1);
			} else {
				countForNum.put(j, 1);
			}
		}

		long start = System.currentTimeMillis();
		for (Integer i : num_) {
			if (i > x) {
//				System.out.println("con");
				continue;
			}
			for (Integer j : num_) {
				if (j > x) {
//					System.out.println("\tcon");
					continue;
				}
				if (i + j == x) {
					count += countForNum.get(i) * countForNum.get(j);
				}
			}
		}
		long end = System.currentTimeMillis();

//		System.out.println(end - start);

		System.out.println(count);
	}

}