Problem3018--跳房子

3018: 跳房子

Time Limit: 2.000 Sec  Memory Limit: 256 MB
Submit: 27  Solved: 9
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Description


Input


Output


Sample Input

7 4 10                                         
2 6
5 -3
10 3
11 -3
13 1
17 6
20 2

Sample Output

2

HINT




Source/Category

 

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