A7. Vika can move through the maze only horizontally or vertically, and she can pass through each cell only once. At the entrance, she has the number 0 recorded on her sheet, and then she adds the numbers she reads on the cells she passes through. How many paths are there that result in a total of 13?
(A) 4
(B) 1
(C) 2
(D) 3
(E) There are no such paths.

$\rightarrow$| 3 | 1 | 5 | 1 |
| :--- | :--- | :--- | :--- |
| 2 | 0 | 2 | 1 |
| 2 | 4 | 2 | 4 |
| 3 | 3 | 1 | 0 |
A7. Through the labyrinth, we can go along the following three paths: $3 \rightarrow 2 \rightarrow 0 \rightarrow 4 \rightarrow 3 \rightarrow 1, 3 \rightarrow 2 \rightarrow$ $0 \rightarrow 2 \rightarrow 1 \rightarrow 4 \rightarrow 0 \rightarrow 1$ and $3 \rightarrow 1 \rightarrow 0 \rightarrow 2 \rightarrow 2 \rightarrow 4 \rightarrow 0 \rightarrow 1$. There are no other paths with a sum of 13, as we can observe that the sum of the numbers along any path that avoids the field with the number $0 \mathrm{v}$ in the second column of the second row is at least 14.