Submit solution

Points:
1.50

Time limit:
1.0s

Memory limit:
512M

Input:
stdin

Output:
stdout

Problem source:

Problem type

Allowed languages

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

In case the statement didn't load correctly, you can download the statement here: Statement

#### Sample Input 1

```
HH
```

#### Sample Output 1

```
2.0
```

#### Sample Input 2

```
H?
```

#### Sample Output 2

```
1.5
```

#### Sample Input 3

```
??
```

#### Sample Output 3

```
1.5
```

## Comments