import numpy as np
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 = np.array(A)
    ans = 0
    for i, a in enumerate(A):
        n = X ^ a
        ans += np.count_nonzero(x[i+1:] == n)
    print(ans)


main()