import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
from collections import defaultdict

n,x = map(int,readline().split())
a = list(map(int,read().split()))

ans = 0
d = defaultdict(int)
for i in a:
    ans += d[i^x]
    d[i] += 1

print(ans)