CF937A Olympiad

题意： 现在有n个人，每个人都有一些分数（0

第一行：一个n，接下来的一行里有n个数。

输出分数的种类。 感谢 @（T_T） 提供的翻译。

There are three ways to choose a subset in sample case one. 1. Only participants with 3 points will get diplomas. 2. Participants with 2 or 3 points will get diplomas. 3. Everyone will get a diploma! The only option in sample case two is to award everyone. Note that in sample case three participants with zero scores cannot get anything.