UVA13178 Is it multiple of 3?

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=871&page=show_problem&problem=5089 [PDF](https://uva.onlinejudge.org/external/131/p13178.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA13178/bdc2e35dbc51370f25db4ab46300d0d661206cfb.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA13178/5e5c4bf0a6c7a09a7c921d1df024c9b0cbb03ca9.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA13178/bdb58edb574f053a79dfd90a0f3f91787d547d7a.png)