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
import java.util.Scanner;

public class Main{
    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);
        int a=sc.nextInt();
        int b=sc.nextInt();
        int c=sc.nextInt();
        System.out.println((b+c-a)>0?(b+c-a):0);
           
    }
}