import sys
input = sys.stdin.readline
from collections import *

N, X = map(int, input().split())
A = [int(input()) for _ in range(N)]
cnt = Counter(A)
ans = 0

for i in range(N):
    pair = A[i]^X
    ans += cnt[pair]
    
    if A[i]==pair:
        ans -= 1

print(ans//2)