We have two bottles for holding water.

Bottle $1$ can hold up to $A$ milliliters of water, and now it contains $B$ milliliters of water.

Bottle $2$ contains $C$ milliliters of water.

We will transfer water from Bottle $2$ to Bottle $1$ as much as possible.

How much amount of water will remain in Bottle $2$?

Input is given from Standard Input in the following format:

```
$A$ $B$ $C$
```

Print the integer representing the amount of water, in milliliters, that will remain in Bottle $2$.

-   All values in input are integers.
-   $1 \leq B \leq A \leq 20$
-   $1 \leq C \leq 20$

1

We will transfer two milliliters of water from Bottle $2$ to Bottle $1$, and one milliliter of water will remain in Bottle $2$.