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

N,X=map(int,input().split())
A=Counter([int(input()) for i in range(N)])

ANS=0

if X!=0:
    for a in A:
        ANS+=A[a]*A[a^X]
else:
    for a in A:
        ANS+=A[a]*(A[a]-1)

print(ANS//2)