N,X=map(int, input().split())
D={}
for i in range(N):
    d=int(input())
    if d not in D:
        D[d]=1 
    else:
        D[d]+=1 
ans=0
if X!=0:
    for i in D:
        e=X^i 
        if e in D:
            ans+=D[i]*D[e]
    print(ans//2)
else:
    for i in D:
        ans+=D[i]*(D[i]-1)//2
    print(ans)