from collections import defaultdict
n,x = map(int,input().split())
a = [int(input()) for i in range(n)]

d = defaultdict(int)
for i in range(n):
    d[a[i]] += 1

ans = 0

for i in range(n):
    if a[i]^x == a[i]:
        ans += d[a[i]^x]-1
    else:
        ans += d[a[i]^x]
print(ans//2)