from collections import defaultdict

N, X = map(int, input().split())
A = [int(input()) for _ in range(N)]

D = defaultdict(int)

for i in range(N):
    D[A[i]] += 1

res = 0

for x in D.keys():
    y = X ^ x
    if y in D:
        if x != y:
            res += D[y] * D[x]
        else:
            res += D[x] * (D[x] - 1)

print(res // 2)