5162: P8720 [蓝桥杯 2020 省 B2] 平面切分
Memory Limit:128 MB
Time Limit:1.000 S
Judge Style:Text Compare
Creator:
Submit:0
Solved:0
Description

Input

Output

Sample Input Copy
3
1 1
2 2
3 3
Sample Output Copy
6
HINT
