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

dic = {}

for i in range(N):

    a = int(input())

    if a not in dic:
        dic[a] = 0
    dic[a] += 1

ans = 0
for i in dic:

    j = X ^ i

    if i == j:
        ans += (dic[i] * (dic[i]-1))//2
    elif i > j and j in dic:
        ans += dic[i] * dic[j]

print (ans)