Email Reminders

 MoEngage helps the Chef send email reminders about rated contests to the participants.

There are a total of N$N$ participants on Chef’s platform, and U$U$ of them have told Chef not to send emails to them.

If so, how many participants should MoEngage send the contest emails to?

Input Format

• The first and only line of input will contain a single line containing two space-separated integers N$N$ (the total number of users) and U$U$ (the number of users who don't want to receive contest reminders).

Output Format

Output in a single line, the number of users MoEngage has to send an email to.

Constraints

• 1≤U<N≤105$1\le U<N\le {10}^5$

Sample Input 1 

100 7

Sample Output 1 

93

Explanation

Out of 100$100$ users, 7$7$ do not want to receive reminders. Hence, MoEngage needs to send email to 93$93$ users.

Sample Input 2 

4456 342

Sample Output 2 

4114

Explanation

Out of 4456$4456$ users, 342$342$ do not want to receive reminders. Hence MoEngage needs to send email to 4114$4114$ users.