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 result = 0;

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

		for (int i = 0; i < N; i++) {
			for (int j = 0; j < N; j++) {
				if (X == Arys[i] + Arys[j]) {
					result++;
				}
			}

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