from collections import defaultdict
N, X = map(int, input().split())
A = []
d = defaultdict(int)
for i in range(N):
    a = int(input())
    d[a] += 1
    A.append(a)

ans = 0
for a in A:
    partner = a ^ X

    if a == partner:
        ans += d[a] - 1

    else:
        ans += d[partner]

ans //= 2
print(ans)