Problem 3705. -- [2017省队模拟]组合数学

3705: [2017省队模拟]组合数学

Time Limit: 10 Sec  Memory Limit: 256 MB
Submit: 1  Solved: 1
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Description

http://begin.lydsy.com/JudgeOnline/upload/3703.pdf

Input

Output

HINT

Source

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