Problem 3734. -- [北京2017冬令营]神秘物质

3734: [北京2017冬令营]神秘物质

Time Limit: 20 Sec  Memory Limit: 256 MB
Submit: 3  Solved: 3
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Description

http://begin.lydsy.com/JudgeOnline/upload/3732.pdf

Input

Output

HINT

Source

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