UVA12039 Goldbach's Cardinality

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=242&page=show_problem&problem=3190 [PDF](https://uva.onlinejudge.org/external/120/p12039.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12039/4eb2e7a4a7dcc700c993ba749260a33c7153333b.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12039/23e69d92bb9b3f3456626a98c2918860445328e9.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12039/586a542d97e0bda61a72e1d58cad4a46cf24e6be.png)