package yukicoder.wa;

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

public class Main2 {

	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(" ");

		int[] num = new int[n];

		Set<Integer> num_ = new HashSet<>();

		for (int i = 0; i < n; i++) {
			num[i] = Integer.parseInt(a[i]);
			// num_.add(sc.nextInt());
		}
		long start = System.currentTimeMillis();
		for (int i = 0; i < n; i++) {
			if (num[i] > x) continue;
			for (int j = 0; j < n; j++) {
				if (num[j] > x) continue;
				if (num[i] + num[j] == x) {
					count++;
				}
			}
		}

		long end = System.currentTimeMillis();
//		System.out.println(end - start);

		System.out.println(count);
	}

}