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.Linq;
using System.Collections.Generic;

namespace atcoder
{
    class Program
    {
        static void Main(string[] args)
        {
            ABC136.Transfer();
        }
    }

    class ABC136
    {
        public static void Transfer()
        {
            int[] n = Input.getIntArray();
            int a = n[0];
            int b = n[1];
            int c = n[2];

            int water = c - (a-b);
            if(water<0) water=0;
            Console.WriteLine(water);
        }

    }
  
    class Input
    {
        public static int getInt()
        {
            int i = int.Parse(Console.ReadLine());
            return i;
        }

        public static string getString()
        {
            string s = Console.ReadLine();
            return s;
        }
        public static int[] getIntArray()
        {
            string[] s = Console.ReadLine().Split(' ');
            int[] num = s.Select(x=>int.Parse(x)).ToArray();
            return num;
        }
        public static long[] getLongArray()
        {
            string[] s = Console.ReadLine().Split(' ');
            long[] num = s.Select(x=>long.Parse(x)).ToArray();
            return num;
        }
    }

}