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Hack!
Time Limit: 3.0 s
Memory Limit: 256 MB
Hackable ✓
# 7203. Four
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Statement
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Custom Test
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The problem was used in the following contest:
ICPCCamp 2016. Day 2. Zhejiang U Contest
Petrozavodsk Winter 2016. Day 5. Zhejiang U Contest (Xi Lin Contest 1)
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