n,x=map(int,input().split())
a=[]
b=dict()
for i in range(n):
    num=int(input())
    a.append(num)
    if num not in b:
        b[num]=1
    else:
        b[num]+=1

c=list(set(a))
#print(b)
#print(c)
ans=0
for i in c:
    m=x^i
    if m in b:
        ans+=b[m]*b[i]
print(ans//2)