#include <stdio.h>
int main()
{
	int n;
	int i;
	int mul=1;
	printf("enter the number upto which output is required\n");
	scanf("%d",&n);
	for ( i = 1;; i++ )
	{
		if (mul < n)
		{
			printf("%d\t",3*i);
			mul = 3*(i+1);
		}
		else
		{
			break;
		}
	}
	return 0;
}