import collections

n, x = map(int, input().split())
a = [int(input()) for _ in range(n)]

d = collections.defaultdict(int)
ans = 0
for i in range(n):
    d[a[i]] += 1
for k in [k for k in d.keys()]:
    u = d[k]
    v = d[k^x]
    ans += u * v
    if x == 0:
        ans -= u
print(ans//2)