p02951 AtCoder Beginner Contest 136 - Transfer
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
```python
A, B, C = list(map(int,input().split()))
print(max((B+C-A),0))
```