Problem Statement

We have removed $A$ balls from a box that contained $N$ balls and then put $B$ new balls into that box. How many balls does the box contain now?

Constraints

• All values in input are integers.
• $100 \leq N \leq 200$
• $1 \leq A,B \leq 100$

Input

Input is given from Standard Input in the following format:

N A B

Output

Print the answer as an integer.