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Background

Description

P3381 最小费用最大流 https://www.luogu.com.cn/problem/P3381

P1251 餐巾计划问题 https://www.luogu.com.cn/problem/P1251

P4015 运输问题 https://www.luogu.com.cn/problem/P4015

POJ3422Kaka's Matrix Travels https://poj.org/problem?id=3422

Format

Input

Output

Samples

Limitation

1s, 1024KiB for each test case.