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