import java.util.*;

public class Main {
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int x = sc.nextInt();
		HashMap<Integer, Integer> map = new HashMap<>();
		for (int i = 0; i < n; i++) {
		    int y = sc.nextInt();
		    if (map.containsKey(y)) {
		        map.put(y, map.get(y) + 1);
		    } else {
		        map.put(y, 1);
		    }
		}
		long total = 0;
		if (x == 0) {
		    for (int y : map.values()) {
		        total += (long)(y - 1) * y / 2;
		    }
		} else {
		    for (Map.Entry<Integer, Integer> entry : map.entrySet()) {
		        int key = entry.getKey() ^ x;
		        int value = entry.getValue();
		        if (map.containsKey(key)) {
		            total += (long)value * map.get(key);
		        }
		    }
		    total /= 2;
		}
		System.out.println(total);
	}
}