import java.util.*;

public class Main {
	public static void main (String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int x = sc.nextInt();
		TreeMap<Integer, Long> map = new TreeMap<>();
		for (int i = 0; i < n; i++) {
		    int a = sc.nextInt();
		    if (map.containsKey(a)) {
		        map.put(a, map.get(a) + 1);
		    } else {
		        map.put(a, 1L);
		    }
		}
		long total = 0;
		for (int y : map.keySet()) {
		    if (y > x) {
		        break;
		    }
		    if (map.containsKey(x - y)) {
		        total += map.get(y) * map.get(x - y);
		    }
		}
		System.out.println(total);
	}
}