| Вход | Ожидаемый результат |
|---|---|
| [[[1, 2], [3, 4]]] | 5 |
| [[[5]]] | 5 |
| [[[1, 2, 3], [4, 5, 6], [7, 8, 9]]] | 15 |
| [[[0, 0], [0, 0]]] | 0 |
| [[[1, 0, 0], [0, 1, 0], [0, 0, 1]]] | 1 |
| [[[2, 3], [4, 5]]] | 7 |
| [[[-1, 2], [3, -4]]] | 5 |
| [[[10, 0, 0], [0, 20, 0], [0, 0, 30]]] | 20 |
| [[[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 12], [13, 14, 15, 16]]] | 34 |
| [[[7, 1], [1, 7]]] | 2 |