import java.util.Scanner;

public class Question723 {
	public static void main(String[] args) {

		//long start = System.currentTimeMillis();

		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int X = sc.nextInt();
		int a[] = new int[N];
		int t[] = new int[N + 1];
		int result = 0;

		for (int i = 0; i < N; i++) {
			a[i] = sc.nextInt();
			t[a[i]]++;
		}

		for (int i = 0; i < N; i++) {
			if (X - a[i] >= 0 && 100000 >= X - a[i]) {
				result += t[X - a[i]];
			}

		}
		//		long end = System.currentTimeMillis();
		//	System.out.println((end - start) + "ms");
		System.out.println(result);
	}
}