#x^y=X,y=x^X
import collections
N,X = map(int,input().split())
lsA = [int(input()) for i in range(N)]
counter = collections.Counter(lsA)
ans = 0
for i in range(N):
    x = lsA[i]
    c = counter[x^X]
    if x == x^X:
        c -= 1
    ans += c
print(ans//2)