N,X=map(int,input().split())

D={}
for i in range(N):
    A=int(input())
    if A not in D:
        D[A]=1
    else:
        D[A]+=1

ans=0
if X==0:
    for k,v in D.items():
        ans+=v*(v-1)
    print(ans//2)


else:
    for k,v in D.items():
        if X^k in D:
            ans+=D[X^k]*v
    print(ans//2)