# 输入输出样例
## 输入样例：
3 4
1
2
1
3
0 5 1
5 0 2
1 2 0
## 输出样例：
7
by LJC00125 @ 2018-03-16 09:18:01
@[LJC00125](/space/show?uid=48319) 感谢您的贡献
by chen_zhe @ 2018-03-16 18:18:01
@[chen_zhe](/space/show?uid=8457) 现在的题面排版很乱，能否修改一下
by d3NtMDAw @ 2018-05-25 19:55:45
@[chen_zhe](/space/show?uid=8457) ++
by MoMaek @ 2018-06-03 18:05:11
@[LJC00125](/space/show?uid=48319) %%% OTZ
by brealid @ 2018-08-06 09:17:15
@[chen_zhe](/space/show?uid=8457) 现在的题面排版很乱，能否修改一下
by andyli @ 2018-10-03 12:28:15
@[ezoixx130](/user/34886) @[chen_zhe](/user/8457) 现在的题面排版很乱，能否修改一下
by Blunt_Feeling @ 2020-05-23 20:34:12
@[yangzhou](/user/219866) fixed
by chen_zhe @ 2020-05-23 20:45:41