import sys

# sys.setrecursionlimit(200005)
int1 = lambda x: int(x)-1
pDB = lambda *x: print(*x, end="\n", file=sys.stderr)
p2D = lambda x: print(*x, sep="\n", end="\n\n", file=sys.stderr)
def II(): return int(sys.stdin.readline())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
def LI1(): return list(map(int1, sys.stdin.readline().split()))
def LLI1(rows_number): return [LI1() for _ in range(rows_number)]
def SI(): return sys.stdin.readline().rstrip()
dij = [(0, 1), (-1, 0), (0, -1), (1, 0)]
# dij = [(0, 1), (-1, 0), (0, -1), (1, 0), (1, 1), (1, -1), (-1, 1), (-1, -1)]
# inf = (1 << 63)-1
inf = (1 << 31)-1
md = 10**9+7
# md = 998244353

n, x = LI()

r = n%4
s = 2
if r == 1:
    ans = [x]
elif r == 2:
    if x == 1:
        ans = [x ^ 2, 2]
        s = 4
    else:
        ans = [x ^ 1, 1]
elif r == 3:
    if x == 3:
        ans = [x ^ 1, 2, 3]
    else:
        ans = [x ^ 3, 1, 2]
    s = 4
else:
    ans = [x, 1, 2, 3]
    s = 4

while len(ans) < n:
    if s != ans[0] and s+1 != ans[0]:
        ans += [s, s+1]
    s += 2

for a in ans: print(a)