Problem C: Zone Selection

Problem C: Zone Selection

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Time Limit : 1.000 sec  Memory Limit : 128 MiB

SubmitProblemListSolved: 5Submit Num: 6StatisticsShowOff!

Description


Input

Output

输出一行一个整数，为答案。

Sample Input Copy 

4 2 2
-1 0
0 -1
2 0
0 2
-1 0
0 2
3 0
0 0

Sample Output Copy 

1

HINT

Submit