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

There are a total of N participants on Chef’s platform, and 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 (the total number of users) and 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 ------

$1 ≤ U < N ≤ 10^{5}$

----- Sample Input 1 ------
100 7
----- Sample Output 1 ------
93
----- explanation 1 ------
Out of $100$ users, $7$ do not want to receive reminders. Hence, MoEngage needs to send email to $93$ users.

----- Sample Input 2 ------
4456 342
----- Sample Output 2 ------
4114
----- explanation 2 ------
Out of $4456$ users, $342$ do not want to receive reminders. Hence MoEngage needs to send email to $4114$ users.

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