N,X=map(int,input().split())
M=10**5
if X>=2:
    if N%4==0:
        ans_lst=[X,1,2,3]
    elif N%4==1:
        ans_lst=[X]
    elif N%4==2:
        ans_lst=[X^1,1]
    else:
        ans_lst=[X^1,2,3]
        
else:
    if N%4==0:
        ans_lst=[1,2,4,6]
    elif N%4==1:
        ans_lst=[1]
    elif N%4==2:
        ans_lst=[2,3]
    else:
        ans_lst=[3,4,6]
for m in range(4,M+3,2):
    if len(ans_lst)<N and not m in ans_lst[:5] and not m+1 in ans_lst[:10]:
        ans_lst.append(m)
        ans_lst.append(m+1)
print(*ans_lst,sep="\n")
assert len(ans_lst)==len(set(ans_lst))==N
xor=0
for a in ans_lst:
    xor^=a
assert xor==X