import collections
N,X = map(int,input().split())
L = []
for i in range(N):
   L.append(int(input()))
CL = collections.Counter(L)
ans = 0
if X!=0:
   for k,v in CL.items():
      ans += v * CL[k^X]
   ans = ans//2
else:
   for k,v in CL.items():
      ans += v * (v-1) //2

print(ans)