import sys
from collections import defaultdict

read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

N, X, *A = map(int, read().split())

answer = 0
counter = defaultdict(int)
for x in A:
    answer += counter[x ^ X]
    counter[x] += 1

print(answer)