#include <stdio.h>
int main()
{
	int n;
	int i;
	int res;
	scanf ("%d", &n);
	for (i = 1; i <= ( n / 3 ); i++)
	{
		res = 3 * i;
		printf ("%d ", res);
	}
	printf ("\n");
	return 0;
}