Contest Duration: - (local time) (100 minutes) Back to Home
A - Transfer /

Time Limit: 2 sec / Memory Limit: 1024 MB

### 制約

• 入力は全て整数である。
• 1 \leq B \leq A \leq 20
• 1 \leq C \leq 20

### 入力

A B C


### 出力

ミリリットル単位で容器 2 の中に残る水の量を整数で出力せよ。

### 入力例 1

6 4 3


### 出力例 1

1


### 入力例 2

8 3 9


### 出力例 2

4


### 入力例 3

12 3 7


### 出力例 3

0


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