from collections import deque

n,x = map(int, input().split())
M = 10**5+6
use = [0]*M
v = 0
for i in range(1,n+1):
    use[i] = 1
    v ^= i

free = deque(range(n+1,M))
cnt = 0
from random import randrange
while v != x:
    while True:
        i = randrange(1,M)
        if use[i]==1: break
    use[i] = 0
    free.append(i)
    v ^= i
    if 0 < v^x < M and use[v^x] == 0:
        use[v^x] = 1
        break
    w = free.popleft()
    use[w] = 1
    v ^= w

for i in range(M):
    if use[i]:
        print(i)