long long输出请使用 %lld服务器的python版本为3.4

Problem K: 有效跑步

Time Limit: 1 Sec  Memory Limit: 128 MB
Submit: 142  Solved: 59
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Description

Input

Output

Sample Input

4 3 4
1000 100
201812345678 0
201887654321 100
201912345678 200
201987654321 1400
201812345678 150
201887654321 700
201987654321 1200
201812345678 400
201887654321 1200
201912345678 400
201987654321 1000

Sample Output

1

HINT

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