import sys
from collections import Counter

def main():
    n, x = map(int, sys.stdin.readline().split())
    a = [int(sys.stdin.readline()) for _ in range(n)]
    cnt = Counter(a)
    ans = 0

    if x == 0:
        for k in cnt:
            c = cnt[k]
            ans += c * (c - 1) // 2
    else:
        seen = set()
        for k in cnt:
            if k in seen:
                continue
            t = k ^ x
            if t not in cnt:
                continue
            if t == k:
                ans += cnt[k] * (cnt[k] - 1) // 2
                seen.add(k)
            else:
                if k < t:
                    ans += cnt[k] * cnt[t]
                    seen.add(k)
                    seen.add(t)
    print(ans)

if __name__ == "__main__":
    main()