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.

Sample Input 1

100 1 2

Sample Output 1

101

The box contained $100$ balls. After removing $1$ ball and putting $2$ new balls, it now contains $101$ balls.

Sample Input 2

100 2 1

Sample Output 2

99

Sample Input 3

100 1 1

Sample Output 3

100