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Contest: Task: Related: TaskB

Score : $100$ points

Problem Statement

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 $2$?

Constraints

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

Input

Input is given from Standard Input in the following format:

$A$ $B$ $C$

Output

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

Sample Input 1

6 4 3

Sample Output 1

1

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

Sample Input 2

8 3 9

Sample Output 2

4

Sample Input 3

12 3 7

Sample Output 3

0