from collections import defaultdict
d = defaultdict(int)
n,x = map(int,input().split())
L = []
for i in range(n):
    a = int(input())
    L.append(a)
    d[a] += 1

ans = 0
for i in range(n):
    ax = L[i]
    if d[ax^x] > 0 and ax^x != ax:
        ans += d[ax^x]
    elif d[ax^x] > 1 and ax^x == ax:
        ans += d[ax^x]-1
print(ans//2)