import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
sys.setrecursionlimit(10 ** 7)

from collections import defaultdict

n, x = map(int, readline().split())
a = [int(readline()) for _ in range(n)]
dict = defaultdict(int)
ans = 0
for aa in a:
    ans += dict[x ^ aa]
    dict[aa] += 1
print(ans)