from collections import defaultdict

n, x = map(int, input().split())
freq = defaultdict(int)
for _ in range(n):
    a = int(input())
    freq[a] += 1

ans = 0
if x == 0:
    for count in freq.values():
        ans += count * (count - 1) // 2
else:
    for a in freq:
        b = a ^ x
        ans += freq[a] * freq.get(b, 0)
    ans //= 2

print(ans)