Problem1016--线图

1016: 线图

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Time Limit : 3.000 sec  Memory Limit : 128 MB

SubmitSolved: 0Submit Num: 1Statistics

Description

Sample Input Copy 

5 3
1 2
2 3
2 5
3 4

Sample Output Copy 

5

HINT

Source/Category

ZJOI2018 
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