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.Collections.Generic;
using System.Text;
using System.Numerics;
using System.IO;


namespace SolutionCS
{
    class Program
    {
        static void Main(string[] args)
        {
            checked
            {
                string[] s;
#if false
                int N = int.Parse(Console.ReadLine());
#else
                s = Console.ReadLine().Split(' ');
                int A = int.Parse(s[0]);
                int B = int.Parse(s[1]);
                int C = int.Parse(s[2]);
#endif


#if true
                /*
                s = Console.ReadLine().Split(' ');
                for (int i = 0; i < N; i++)
                {
                    v[i] = int.Parse(s[i]);
                }
                */
#else
                for (int i = 0; i < N; i++)
                {
                    v[i] = int.Parse(Console.ReadLine());
                }
#endif

                Console.WriteLine(Math.Max(0, C - (A - B)));
            }
        }
    }
}