N,X = map(int,input().split())
A = [int(input()) for i in range(N)]
from collections import Counter
ctr = Counter(A)

if X:
    ans = 0
    for k,v in ctr.items():
        ans += ctr[k^X]*v
    ans //= 2
    print(ans)
else:
    ans = 0
    for v in ctr.values():
        ans += v*(v-1)//2
    print(ans)