#include <iostream>
#include <vector>
#include <algorithm>
#include <array>
#include <iterator>
#include <string>
#include <cctype>
#include <cstring>
#include <cstdlib>
#include <cassert>
#include <cmath>
#include <ctime>
#include <iomanip>
#include <numeric>
#include <stack>
#include <queue>
#include <map>
#include <unordered_map>
#include <set>
#include <unordered_set>
#include <bitset>
#include <random>
#include <utility>
#include <functional>
using namespace std;
void Main()
{
	int N,X;
	cin >> N >> X;
	const int M = (int)1e5;
	vector<int> ans;
	int r = N % 4;
	if(X >= 4)
	{
		if(r == 1)
		{
			ans.push_back(X);
		}
		else if(r == 2)
		{
			ans.push_back(X ^ 1);
			ans.push_back(1);
		}
		else if(r == 3)
		{
			ans.push_back(X ^ 3);
			ans.push_back(1);
			ans.push_back(2);
		}
		else 
		{
			ans.push_back(X);
			ans.push_back(1);
			ans.push_back(2);
			ans.push_back(3);
		}
		for(int i = 4;i <= M && ans.size() < N;i += 4)
		{
			if(i <= X && X < i + 4)
			{
				continue;
			}
			for(int j = 0;j < 4;j++)
			{
				ans.push_back(i + j);
			}
		}
	}
	else
	{
		if(r == 1)
		{
			ans.push_back(X);
		}
		else if(r == 2)
		{
			for(int i = 1;i <= 3;i++)
			{
				if(i != X)
				{
					ans.push_back(i);
				}
			}
		}
		else if(r == 3)
		{
			if(X == 1)
			{
				ans.push_back(2);
				ans.push_back(4);
				ans.push_back(7);
			}
			else if(X == 2)
			{
				ans.push_back(1);
				ans.push_back(4);
				ans.push_back(7);
			}
			else
			{
				ans.push_back(1);
				ans.push_back(4);
				ans.push_back(6);
			}
		}
		else
		{
			int y = X % 3 + 1;
			ans.push_back(X);
			ans.push_back(y);
			ans.push_back(4);
			ans.push_back(4 ^ y);
		}
		for(int i = 8;i <= M && ans.size() < N;i += 4)
		{
			if(i <= X && X < i + 4)
			{
				continue;
			}
			for(int j = 0;j < 4;j++)
			{
				ans.push_back(i + j);
			}
		}
	}
	assert((int)ans.size() == N);
	int x = 0;
	for(int i = 0;i < N;i++)
	{
		x ^= ans[i];
	}
	assert(x == X);
	for(int i = 0;i < N;i++)
	{
		cout << ans[i] << (i + 1 == N ? "\n" : " ");
	}
}
int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	int tt = 1;
	/* cin >> tt; */
	while(tt--) Main();
}