N, X = map(int, input().split())
A = [int(input()) for _ in range(N)]
from collections import defaultdict

dic = defaultdict(int)
for a in A:
    dic[a] += 1
ans = 0
for k, v in dic.items():
    if k ^ X in dic:
        ans += dic[k] * dic[k ^ X]
print(ans // 2)