4615: P1413 坚果保龄球
Memory Limit:128 MB
Time Limit:1.000 S
Judge Style:Text Compare
Creator:
Submit:0
Solved:0
Description

Input

Output

Sample Input Copy
10
1 1
1 61
2 1
2 60
3 1
3 2
3 3
3 4
4 1
4 99999
Sample Output Copy
6
HINT
