问题描述：
英语翻译
One day,a post office in which you are working during your visit to Ankh-Morpork runs
out of all postage stamps except for an unlimited supply of 3-cent and 7-cent ones.The
Postmaster asks you to determine all possible denominations you can make using
combinations of 3-cent and 7-cent stamps.What can you report to the Postmaster?
One day,a post office in which you are working during your visit to Ankh-Morpork runs
out of all postage stamps except for an unlimited supply of 3-cent and 7-cent ones.The
Postmaster asks you to determine all possible denominations you can make using
combinations of 3-cent and 7-cent stamps.What can you report to the Postmaster?
问题解答：
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