# Ai^Aj=Xということは、Ai=Aj^X
# Counter
# X==0 and or Ai==0のときは別対応必要ないみたい
# ダブルカウント避ける

N, X = map(int, input().split())
A = []
for i in range(N):
    A.append(int(input()))
from collections import Counter
counted = Counter(A)

ans = 0
for i in range(N):
    counted[A[i]] -= 1
    xa = X^A[i]
    calc = counted[xa]
    ans += calc
print(ans)