If:
+-------+ +-------+ +-------+ +-------+ +-------+ +-------+
|O O| |0 | |0 0| |0 | |0 | |0 0|
| 0 | | | |0 0| | 0 | | | |0 0| = 5
|0 0| | 0| |0 0| | 0| | 0| |0 0|
+-------+ +-------+ +-------+ +-------+ +-------+ +-------+
+-------+ +-------+ +-------+ +-------+ +-------+ +-------+
| | | | |0 0| |0 | | | |0 0|
| 0 | | 0 | | 0 | | | | 0 | | | = 9
| | | | |0 0| | 0 | | | |0 0|
+-------+ +-------+ +-------+ +-------+ +-------+ +-------+
+-------+ +-------+ +-------+ +-------+ +-------+ +-------+
|0 | |0 | |0 0| |0 0| |0 | |0 0|
| 0 | | | | 0 | | 0 | | 0 | | 0 | = 11
| 0| | 0| |0 0| |0 0| | 0| |0 0|
+-------+ +-------+ +-------+ +-------+ +-------+ +-------+
+-------+ +-------+ +-------+ +-------+ +-------+ +-------+
|0 | |0 | |0 | |0 | |0 | |0 |
| | | 0 | | | | 0 | | | | 0 | = 16
| 0| | 0| | 0| | 0| | 0| | 0|
+-------+ +-------+ +-------+ +-------+ +-------+ +-------+
What is:
+-------+ +-------+ +-------+ +-------+ +-------+ +-------+
| | |0 | |0 | |0 0| |0 0| |0 0|
| 0 | | | | 0 | | | | 0 | |0 0| = ?
| | | 0| | 0| |0 0| |0 0| |0 0|
+-------+ +-------+ +-------+ +-------+ +-------+ +-------+
The required answer is 0.