from bisect import bisect_left
from collections import defaultdict
from sys import stdin


def main():
    input = lambda: stdin.readline()[:-1]
    N, X = map(int, input().split())
    A = [int(input()) for _ in [0] * N]

    x = defaultdict(list)
    for i, a in enumerate(A):
        x[a].append(i)

    ans = 0
    for i, a in enumerate(A):
        n = X ^ a
        ans += len(x[n]) - bisect_left(x[n], i)
    print(ans)


main()