class CStamp_problem 
{
	int[] kinds=new int[27];
	void printkinds()
	{
		//t:3分郵票張數(shù)；f：5分郵票張數(shù)；v:一種郵資的可能值
		int t,f,v=0;
		//i:郵資種類序員；n:郵資種類數(shù)
		int i,n=0;
		for(t=0;t<=4;t++)
		  for(f=0;f<=3;t++)
		  {
		  	v=t*3+f*5;
		  	for(i=0;kinds[i]!=0;i++)
		  	  if(v==kinds[i]) break;
		  	  if (kinds[i]==0&&v!=0)
		  	  {
		  	  	kinds[i]=v;
		  	  	n++;
		  	  }
		  	 }
		  	 System.out.println("kinds="+n);
		  	 for(i=0;kinds[i]!=0;i++)
		  	 System.out.println(i+" 's:"+kinds[i]);
		  }
}
		  	  	
public class Stamp 
{
	public static void main(String args[])
	{				
		CStamp_problem s=new CStamp_problem();
		s.printkinds();
	}				
}