Problem:
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

Solution in C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;
namespace Answer{
	class Program {
  		public static void Main(string[] args) {
            char[] charSeparators = new char[] {' '};
    		var values = Console.ReadLine().Split(charSeparators, StringSplitOptions.RemoveEmptyEntries);
    		var A = int.Parse(values[0]);
    		var B = int.Parse(values[1]);
    		var C = int.Parse(values[2]);
    
    		var ans = Math.Max(0, C - (A - B));
    		Console.WriteLine(ans);
  		}
	}
}