10
5 0
0 5
0 0
0 0
0 3
0 -3
4 0
- 4 0
10 10
1 3
2 3
4 2
5 5
5 3
4 5
0 3
4 0
4 1
2 2
0 0
1 1
5 0
0 5
0 0
0 0
0 3
0 -3
4 0
- 4 0
10 10