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

inputFormat

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

outputFormat

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

样例

12 3 7

0