import  collections
n,x=map(int,input().split())
a=[int(input()) for i in range(n)]
ans=0
tmp=collections.Counter(a)
ty=tmp.items()
if x==0:
    for i,j in ty:
        ans+=(j*(j-1)//2)
    print(ans)
else:
    for i , j in ty:
        b=i^x
        ans+=tmp[b]*j
    print(ans//2)