n,x=map(int,input().split())
a=[int(input()) for i in range(n)]
watch=set([])
ans=0
if x==0:
    for i in range(n):
        y=a[i]
        if not y in watch:
            cnt=a.count(y)
            ans+=cnt*(cnt-1)//2
            watch.add(y)
    print(ans)
    exit()
else:
    for i in range(n):
        b=x^a[i]
        ans+=a.count(b)
print(ans//2)