Submit solution

Points:
1.50

Time limit:
3.0s

Memory limit:
512M

Input:
stdin

Output:
stdout

Author:

Problem type

Allowed languages

C, C++, Java, Kotlin, Pascal, PyPy, Python, Scratch

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#### Sample Input 1

```
6 7
_ _ _ _ _ _ _
| | _ _| _ |
| | |_ _| |_| |
| |_ _ _| _ _|
| | _ _| | |
| | |_ _| | |
|_|_ _ _|_|_ _|
6 3 7 2 2 2
```

#### Sample Output 1

```
1
```

#### Sample Input 2

```
2 3
_ _ _
| |
|_ _ _|
-1 -1
```

#### Sample Output 2

```
3
```

#### Sample Input 3

```
3 3
_ _ _
| _ |
| | | |
|_|_|_|
-1 1 1
```

#### Sample Output 3

```
1
```

## Comments