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;
using System.Text; 
using System.Collections.Generic;
using System.Linq;

public class Remainder
{
    static char[,] cab;
    static string[] pic;
    static long H;
    static long W;

    static public void Main ()
    {
        var ABC = Console.ReadLine().Split(' ').Select(x => long.Parse(x)).ToArray();
        var A = ABC[0];
        var B = ABC[1];
        var C = ABC[2];
        
        var res =  B+C-A;
        
        if( res >= 0){
            Console.WriteLine(res);
        }else{
            Console.WriteLine(0);
        } 
        

    }
    
    

}