import sys; input = sys.stdin.buffer.readline
sys.setrecursionlimit(10**7)
from collections import defaultdict
con = 10 ** 9 + 7; INF = float("inf")

def getlist():
	return list(map(int, input().split()))

#処理内容
def main():
	N, X = getlist()
	D = defaultdict(int)
	for i in range(N):
		A = int(input())
		D[A] += 1
		D[A ^ X] += 0

	ans = 0
	if X == 0:
		for key, value in D.items():
			ans += int((value) * (value - 1) // 2)
		print(ans)

	else:
		for key, value in D.items():
			ans += value * D[key ^ X]
		print(int(ans) // 2)


if __name__ == '__main__':
	main()