N,X=map(int,input().split())
A={}
U=set()

for i in range(N):
    a=int(input())
    U.add(a)
    if a in A:
        A[a]+=1
    else:
        A[a]=1

S=0
while U:
    x=U.pop()
    y=X^x
    if (x!=y) and (X^x in U):
        U.remove(y)
        S+=A[x]*A[y]
    if y==x:
        S+=(A[x]*(A[x]-1))//2
                      
        
                      

print(S)