n,x=map(int,input().split())
a=[]
for i in range(n):
    num=int(input())
    a.append(num)

a.sort()
ans=0
for i in range(n):
    m=x^a[i]
    if m not in a[i+1:]:
        continue
    for j in a[i+1:]:
        if m==j:
            ans+=1
print(ans)