N,X=map(int,input().split())
D=dict()
A=[int(input()) for i in range(N)]
for i in range(N):
  D[A[i]]=D.get(A[i],0)+1
P=0
if X:
  for i in range(N):
    P+=D.get(A[i]^X,0)
  print(P//2)
else:
  for i in range(N):
    P+=D[A[i]]-1
    D[A[i]]-=1
  print(P)