Roads in the North

题目描述

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=15&page=show_problem&problem=1249 [PDF](https://uva.onlinejudge.org/external/103/p10308.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10308/a5b0017c73c1efd35c517c5bd2e22fa4fc47b5a2.png)

输入输出格式

输入格式


![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10308/4c9f0cb9897100b3c5422bb470b48a7c297947d9.png)

输出格式


![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10308/6681e5fc7fb2e8695bfbd99b954c9899a344269b.png)

输入输出样例

输入样例 #1

5 1 6
1 4 5
6 3 9
2 6 8
6 1 7

输出样例 #1

22