from collections import Counter

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

counter = Counter(A)
seen = set()
ans = 0
for val, cnt in counter.items():
    if val in seen:
        continue
    res = x ^ val
    if res == val:
        ans += cnt * (cnt - 1) // 2
    else:
        ans += cnt * counter[res]
    seen.add(val)
    seen.add(res)
print(ans)