n,x=map(int,input().split())
a=[int(input()) for _ in range(n)]
from collections import Counter
ans=0
b=Counter(a)
if x==0:
    for key,val in b.items():
        ans+=val*(val-1)//2
    print(ans)
    exit()
for i in a:
    if i^x in b:
        ans+=b[i^x]
print(ans//2)