from collections import Counter
n, x = map(int, input().split())
a = [int(input()) for i in range(n)]
a.sort()
c = Counter(a)
ans = 0
for i in range(n - 1):
    if a[i] ^ a[i + 1] == x:
        ans += c[a[i]] * c[a[i + 1]]
print(ans)