from collections import Counter
import sys
input = sys.stdin.buffer.readline
sys.setrecursionlimit(10 ** 7)

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

C1 = Counter(A)
C2 = Counter(B)
if X == 0:
    ans = sum(v*(v-1)//2 for v in C1.values())
else:
    ans = 0
    for k1, v1 in C1.items():
        k2 = k1 ^ X
        v2 = C2[k2]
        ans += v1 * v2
    ans //= 2

print(ans)