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: Wrong Answer)

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

namespace Atc_0028
{
    class Program
    {
        static void Main(string[] args)
        {
            string str = Console.ReadLine();

            int A = int.Parse(str.Split(' ')[0]);

            int B = int.Parse(str.Split(' ')[1]);

            int C = int.Parse(str.Split(' ')[2]);

            int tmp = A - B;

            if (tmp == 0)
            {
                Console.WriteLine(0);

                return;
            }

            tmp = C - tmp;

            if (tmp < 0)
            {
                tmp = 0;
            }

            Console.WriteLine(tmp);

        }
    }
}