#include<iostream>
#include<vector>
using namespace std;
int N,X;
vector<int>ans;
main()
{
	cin>>N>>X;
	if(X<=3)
	{
		int id=8;
		while(N>4)
		{
			N-=4;
			ans.push_back(id++);
			ans.push_back(id++);
			ans.push_back(id++);
			ans.push_back(id++);
		}
		if(N==1)ans.push_back(X);
		else if(N==2)
		{
			ans.push_back(4);
			ans.push_back(4^X);
		}
		else if(N==3)
		{
			if(X%4==1)
			{
				ans.push_back(2);
				ans.push_back(4);
				ans.push_back(4^X^2);
			}
			else
			{
				ans.push_back(1);
				ans.push_back(4);
				ans.push_back(4^X^1);
			}
		}
		else
		{
			if(X%4==3)
			{
				ans.push_back(1);
				ans.push_back(3);
				ans.push_back(4);
				ans.push_back(4^X^1^3);
			}
			else
			{
				ans.push_back(1);
				ans.push_back(2);
				ans.push_back(4);
				ans.push_back(4^X^1^2);
			}
		}
	}
	else
	{
		int id=4;
		while(N>4)
		{
			if(id/4==X/4)id+=4;
			N-=4;
			ans.push_back(id++);
			ans.push_back(id++);
			ans.push_back(id++);
			ans.push_back(id++);
		}
		if(N==1)ans.push_back(X);
		else if(N==2)
		{
			ans.push_back(1);
			ans.push_back(X^1);
		}
		else if(N==3)
		{
			ans.push_back(1);
			ans.push_back(2);
			ans.push_back(X^1^2);
		}
		else
		{
			ans.push_back(1);
			ans.push_back(2);
			ans.push_back(3);
			ans.push_back(X);
		}
	}
	for(int a:ans)cout<<a<<endl;
}