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Background

Description

P3376 网络最大流 https://www.luogu.com.cn/problem/P3376

P2740 草地排水 https://www.luogu.com.cn/problem/P2740

P1402 酒店之王https://www.luogu.com.cn/problem/P1402

POJ1149 PIGS http://poj.org/problem?id=1149

POJ1273 PIG http://poj.org/problem?id=1273

P1343 地震逃生https://www.luogu.com.cn/problem/P1343

Format

Input

1

Output

1

Samples

1

1

Limitation

1s, 1024KiB for each test case.