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

d = {}
for a in A:
    d.setdefault(a, 0)
    d[a] += 1

ans = 0
if x == 0:
    for i in d.values():
        ans += i * (i -1) // 2
    print(ans)
else:
    for i in d:
        if i ^ x in d:
            ans += d[i] * d[i ^ x]
    print(ans // 2)