题目描述
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.
Examples
Input
6 4 3
Output
1
Input
8 3 9
Output
4
Input
12 3 7
Output
0
输入格式
见题面
输出格式
见题面
样例输入
12 3 7
样例输出
0