import sys
readline = sys.stdin.readline
from collections import *

N, X = map(int, readline().split())
D = defaultdict(int)
for i in range(N):
    A = int(input())
    D[A] += 1
    D[X ^ A] += 0
    
ans = 0
for k, v in D.items():
    ans += D[k] * D[X ^ k]
if X == 0:
    ans -= N
print(ans//2)