n,x=map(int,input().split())
a=[int(input()) for _ in range(n)]
from collections import Counter
c=Counter(a)
ans=0
if x==0:
  for v in c.values():
    ans+=v*(v-1)//2
  print(ans)
else:
  for k in c.keys():
    b=k^x
    ans+=c[b]*c[k]
  print(ans//2)