Wooden Fence

6
0 0 8 3
1 4 3 2
2 1 7 1
4 1 2 3
3 5 4 6
2 3 9 8
3
3 0 10 3
5 -3 20 25
7 -3 30 32
2
100 0 5 4
0 100 4 5
5
0 0 10 10
0 1 10 10
1 0 10 10
1 1 10 10
50 50 8 4
0

The lost value is 9.
The lost value is 20.
The lost value is 4.
The lost value is 8.