5307: 【GESP202403六级】好斗的牛

Memory Limit:128 MB Time Limit:1.000 S
Judge Style:Text Compare Creator:
Submit:1 Solved:1

Description

Input

Output

Sample Input Copy

2
1 2
1 2

Sample Output Copy

4

HINT

样例解释 1 

 你可以留下4个⽜棚,并如此安排你的⽜: