/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		Scanner s=new Scanner(System.in);
		int N=s.nextInt();
		solve(N);
	}
	public static void solve(int N){
		if(N<0){
			return;
		}
		System.out.println(N);
		solve(N-1);
		System.out.println(N+1);
	}
}