4589: P1183 多边形的面积
          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
0 0
4 0
4 1
3 1
3 3
2 3
2 2
1 2
1 3
0 3Sample Output Copy
9HINT
