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 Rust (1.15.1) (judge verdict: Accepted)

use std::cmp::{max, min};

fn main() {
  let (a, b, c) = {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).unwrap();
    let mut ws = s.split_whitespace();
    let a: i64 = ws.next().unwrap().parse().unwrap();
    let b: i64 = ws.next().unwrap().parse().unwrap();
    let c: i64 = ws.next().unwrap().parse().unwrap();
    (a, b, c)
  };

  print!("{}", c - (min(a, b + c) - b));
}