# Test

# Test 1

```test
> 0
-1
0
```

# Test 2

```test
> 1
> 2
> 3
> -1
2
```

# Test 3

```test
> 2
> 2
> 4
> -1
2
```

# Test 4

```test
> 2
> 3
> 2
> 3
> -1
2.5
```

# Test 5

```test
> 20
> 30
> 20
> 10
> -1
20
```