这是一个邮票封面设计的程序代码，在邮票数是Ｎ，邮票种类是Ｋ的情况下，计算出最大邮资值和尽可能组成的种类．-This is a cover design of the stamps code, the N is the number of stamps, the stamp is a type K circumstances, the calculated postage value and the largest component of the possible types.