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

cnt = 0
from random import randrange
while v != x:
    idx = randrange(0,n)
    y = use[idx]
    v ^= y
    if 0 < v^x < M and use_lst[v^x]==0:
        use[idx] = v^x
        break
    jdx = randrange(0,nn)
    w = free[jdx]
    v ^= w
    use_lst[y] = 0
    use_lst[w] = 1
    use[idx],free[jdx] = w,y

for i in use:
    print(i)