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)]
C = Counter(A)

ans = 0
for a in A:
    C[a] -= 1
    ans += C[a ^ X]

print(ans)