#include <stdio.h>
int main()
{	
	int i;
	int n;
	int b;
	int p;
	b = 3;
	printf("Enter the no.\n");
	scanf("%d",&n);
	for (i = 1; i <= n/3; i++)
       	{
		p = b * i;
		printf("%d ",p);
	}
	printf("\n");
	return 0;
}