from collections import defaultdict

N,X=map(int,input().split())
cnt=defaultdict(int)
A=[]
for i in range(N):
    a=int(input())
    A.append(a)
    cnt[a]+=1
ans=0
for a in A:
    ans+=cnt[X^a]
if X==0:
    ans-=N
ans//=2
print(ans)