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 $2$.