#include <iostream>

using namespace std;
int main(){
	int i,j,n,x,y = 0;
	cin >> n >> x;
	for(i=4;i<=100000;i+=4){
		if(i==x/4*4) continue;
		if(n<=4) break;
		for(j=0;j<4;j++){
			cout << i + j << endl;
			y ^= i + j;
		}
		n -= 4;
	}
	if(n==1){
		cout << x << endl;
	}
	if(n==2){
		if(x>1){
			cout << (x^1) << endl;
			cout << 1 << endl;
		}else{
			cout << 2 << endl;
			cout << 3 << endl;
		}
	}
	if(n==3){
		if(x>3){
			cout << (x^3) << endl;
			cout << 1 << endl;
			cout << 2 << endl;
		}else{
			if(x>1){
				cout << (100000^x) << endl;
				cout << 100001 << endl;
				cout << 1 << endl;
			}else{
				cout << (100000^x) << endl;
				cout << 100002 << endl;
				cout << 2 << endl;
			}
		}
	}
	if(n==4){
		if(x>3){
			cout << x << endl;
			cout << 1 << endl;
			cout << 2 << endl;
			cout << 3 << endl;
		}else{
			if(x<3){
				cout << x << endl;
				cout << 3 << endl;
				cout << 100001 << endl;
				cout << 100002 << endl;
			}else{
				cout << x << endl;
				cout << 100003 << endl;
				cout << 100001 << endl;
				cout << 2 << endl;
			}
		}
	}
}