Problem F: noip2018 龙虎斗

Problem F: noip2018 龙虎斗

Time Limit: 1 Sec  Memory Limit: 128 MB
Submit: 14  Solved: 6
[Status] [Submit] [Creator:]

Description


Sample Input Copy 

6 
2 3 2 3 2 3 
4 6 5 2

Sample Output Copy 

2

HINT



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