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 Python (3.8.2) (judge verdict: Accepted)

import sys
a=sys.stdin.readline()
res=[i for i in a.split()]
A,B,C=[float(res[i]) for i in (0,1,2)]
E,F,G=A.is_integer(),B.is_integer(),C.is_integer()
if E==F==G==True:
    if 1<=B<=A<=20 and 1<=C<=20:
        w=C-A+B
        if w<0:
            print(0)
        else:
            print(int(w))