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# (.NET Core 3.1.201) (judge verdict: Accepted)

using System;

namespace newEx
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] l = Console.ReadLine().Split(' ');
            int p = int.Parse(l[0]);
            int q = int.Parse(l[1]);
            int r = int.Parse(l[2]);

            //string l = Console.ReadLine();
            //int r = int.Parse(l);

            Console.WriteLine(Volume(p,q,r));
        }

        static int Volume(int A, int B, int C)//修正200630
        {
            //容器２のあまり
            if (C > A - B)  //修正200630
            {
                return (C - (A - B));
            }
            else
            //if (A < B)  //修正200630
            {
                return 0;
            }                                    //修正200630
        }
    }
}