import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		new Main().run();
	}

	void run() {
		Scanner sc = new Scanner(System.in);
		int[] cnt = new int[1000001];
		int n = sc.nextInt();
		int x = sc.nextInt();
		int[] a = new int[n];
		for (int i = 0; i < n; ++i) {
			a[i] = sc.nextInt();
			cnt[a[i]]++;
		}
		long ans = 0;
		for (int i = 0; i < n; ++i) {
			if (x - a[i] < 0 || x - a[i] >= cnt.length)
				continue;
			ans += cnt[x - a[i]];
		}
		System.out.println(ans);
	}
}