N,X=map(int,input().split())
M=10**5
if N%4==0:
    ans_lst=[X,1,2,3]
elif N%4==1:
    ans_lst=[X]
elif N%4==2:
    if X>=2:
        ans_lst=[X^1,1]
    else:
        ans_lst=[2,3]
else:
    if X>=2:
        ans_lst=[X^1,2,3]
    else:
        ans_lst=[3,4,6]
for m in range(8,M+2,4):
    if len(ans_lst)<N:
        for dm in range(4):
            ans_lst.append(m+dm)
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