/* 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);
	}
}

LyogcGFja2FnZSB3aGF0ZXZlcjsgLy8gZG9uJ3QgcGxhY2UgcGFja2FnZSBuYW1lISAqLwoKaW1wb3J0IGphdmEudXRpbC4qOwppbXBvcnQgamF2YS5sYW5nLio7CmltcG9ydCBqYXZhLmlvLio7CgovKiBOYW1lIG9mIHRoZSBjbGFzcyBoYXMgdG8gYmUgIk1haW4iIG9ubHkgaWYgdGhlIGNsYXNzIGlzIHB1YmxpYy4gKi8KY2xhc3MgSWRlb25lCnsKCXB1YmxpYyBzdGF0aWMgdm9pZCBtYWluIChTdHJpbmdbXSBhcmdzKSB0aHJvd3MgamF2YS5sYW5nLkV4Y2VwdGlvbgoJewoJCVNjYW5uZXIgcz1uZXcgU2Nhbm5lcihTeXN0ZW0uaW4pOwoJCWludCBOPXMubmV4dEludCgpOwoJCXNvbHZlKE4pOwoJfQoJcHVibGljIHN0YXRpYyB2b2lkIHNvbHZlKGludCBOKXsKCQlpZihOPDApewoJCQlyZXR1cm47CgkJfQoJCVN5c3RlbS5vdXQucHJpbnRsbihOKTsKCQlzb2x2ZShOLTEpOwoJCVN5c3RlbS5vdXQucHJpbnRsbihOKzEpOwoJfQp9

Mw==

3