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PKU v. THU (Preliminary Round 2)
Time Limit: 1 s
Memory Limit: 512 MB
Hackable ✓
# 4274. $2x + 2$
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Custom Test
The problem was used in the following contest:
ICPCCamp 2015. Day 2.
Petrozavodsk Winter 2015. Day 3. Chinese Contest
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