# coding: utf-8
# Your code here!
import sys
read = sys.stdin.read
readline = sys.stdin.readline

#n,k,x,y *a = map(int,read().split())
n,x,*a = map(int,read().split())

d = {}
for i in a:
    if i in d: d[i] += 1
    else: d[i] = 1

ans = 0
for i in a:
    if x^i in d: ans += d[x^i]

if x==0:
    ans -= n

print(ans//2)