#include <stdio.h>
int main()
{
	int i;
	int a = 0;
	int b;
	int n;
	printf("Enter the number :\n");
	scanf("%d",&n);
	if(n % 3 == 0)
	{
		a = n / 3;
		for(i = 1 ; i <= a ; i++)
		{
			printf("%d ", (3 * i));
		}
	}
	else
	{
		b = n % 3;
		n = n - b;
		a = n / 3;
		for(i = 1 ; i <= a ; i++);
		{
			printf("%d ",(3 *i));
		}
	}
	return 0;
}