from collections import Counter

n, x = map(int, input().split())
A = [int(input()) for _ in range(n)]
c = Counter(A)

res = 0
if x == 0:
    for k,v in c.items():
        res += v * (v - 1) // 2
    print(res)
else:
    for k, v in c.items():
        if k ^ x in c.keys():
            res += c[k] * c[k ^ x]
    print(res // 2)