import collections

N, X = map(int,input().split())

A = [0]*N
for i in range(N):
    A[i] = int(input())
    
cards = set(A)
cnt = collections.Counter(A)

ans = 0 
for key, value in cnt.items():
    if X^key in cards:
        ans += value*cnt[key]
        
print(ans//2)