说明：  输出格式: 要求按5分、2分和1分硬币的数量依次从大到小的顺序，输出各种换法。每行输出一种换法，格式为：“fen5:5分硬币数量, fen2:2分硬币数量, fen1:1分硬币数量, total:硬币总数量”。最后一行输出“count = 换法个数”。
(Output format: It is required to output all kinds of exchange methods according to the order of 5 minutes, 2 minutes and 1 minute coins. Output a conversion method for each line, the format is: "fen5:5 coin quantity, fen2:2 coin quantity, fen1:1 coin quantity, total: total coin quantity". The last line outputs "count = number of transformations".)