N,X=map(int,input().split())
A=[0 for i in range(N)]
for i in range(N):
    A[i]=int(input())
d=dict()
ans=0
for i in range(N):
    if X^A[i] in d:
        ans+=d[X^A[i]]
    if not A[i] in d:
        d[A[i]]=0
    d[A[i]]+=1
print(ans)