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

namespace ABC_Training
{
    public class WaterContainer
    {
        int _a, _b, _c;
        public WaterContainer(int a, int b, int c)
        {
            _a = a;
            _b = b;
            _c = c;
        }

        public int RemainWaterInB => Math.Max(_c - (_a - _b), 0);
    }
    class Program
    {
        static void Main(string[] args)
        {
            var abc = Console.ReadLine().Split(' ').Select(int.Parse).ToArray();
            var a = abc[0];
            var b = abc[1];
            var c = abc[2];

            var waterContainer = new WaterContainer(a, b, c);
            int result = waterContainer.RemainWaterInB;

            Console.WriteLine(result);
        }

    }
}