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