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 = [0] * N
    for i in range(N):
        x[i] = X ^ A[i]

    ans = 0
    for i, a in enumerate(A):
        n = X ^ a
        ans += A[i+1:].count(n)
    print(ans)


main()