问题描述：某国家的硬币体系包含N种面值（其中一定有面值为1的），现有一种商品价格为P,最少要用多少枚硬币可以买下-Problem Descr iption: A national system contains N kinds of coins with a face value (which must have a face value of 1), the current price of a commodity for P, at least take the number of coin