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
if X == 0:
    for k,v in dic.items():
        ans += v * (v-1) // 2
    print(ans)
    exit()

for k, v in dic.items():
    if k ^ X in dic:
        ans += dic[k] * dic[k ^ X]
print(ans // 2)