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

// The main method must be in a class named "Main".
class Main {
    public static void main(String[] args) {
        //System.out.println("Hello world!");
        
        Scanner scn = new Scanner(System.in);
            int N = scn.nextInt();

            int i = 2;
            int n = N;
    

            while(N>=0){
                if (N%2==0)
                {
                System.out.print(N + " ");
                N--;
                }
                else if(N !=0){
                N--;
                }
            }
    }
}