from bisect import bisect_right, bisect_left

n, x = map(int, input().split())
alst = [int(input()) for _ in range(n)]
ans = 0
alst.sort()
for a in alst:
    xor = a ^ x
    ans += bisect_right(alst, xor) - bisect_left(alst, xor)
print(ans // 2)