NGM2 - Another Game With Numbers


Little Chikoo likes to play with numbers. Often he plays the following game:

  1. He chooses a number N and a set of positive integers.
  2. He writes down all the numbers from 1 to N.
  3. He chooses the first number (say x) from the set and cancels out all the multiples of x from 1 to N, including x.
  4. He repeats step 3 for all the numbers from the set.

One day Little Chikoo was in a mood to play pranks. So his brother asked him to play the game with a certain challenge. He made the game a little harder and asked him to find out the number of integers which aren't cancelled after he completes step 4. If he does that then Little Chikoo gets to play on his brother's Nintendo for one full day. Now Little Chikoo is in a hurry and wants to finish the job as soon as possible. He has asked for your help.

Input

The first line of the input contains N and K. (N <= 10^9, K <= 15)

Then K numbers follow all in a single line. All numbers are <= 100.

Output

The output file must contain the number of integers that aren't cancelled after he finishes step 4 of the game.

Example

Input:
10 3
2 4 5

Output:
4

(The numbers 1, 3, 7 and 9 weren't cancelled).


hide comments
Bhumit: 2016-09-05 10:53:40

@Paranoid Android
Can you please tell why I am getting NZEC in Java??
Submission ID - 17652754

[Mayank Pratap]: 2016-06-13 08:09:05

WA on 21 .. any help ??

kejriwal: 2016-02-01 17:05:54

AC in one go :) !!!
same algorithm in python giving NZEC/TLE/WA xP
@author can you tell me the glitch !

Last edit: 2016-02-02 17:50:24
GAURAV CHANDEL: 2016-01-20 16:51:34

Nice problem...

darkhire21: 2015-09-06 18:38:32

TLE in 25th test case

sancha: 2015-01-07 06:46:18

g++ 4.3.2 gives this error "Language available only on Cube Cluster"

ayushi agarwal: 2014-11-18 12:17:26

got the problem i was using int instead of long long

ayushi agarwal: 2014-11-18 11:58:18

wrong answer on run 25. can anyone tell why?

Praneeth Reddy: 2014-09-05 13:19:32

getting WA at 25....what is happening???

eti goel: 2014-08-06 21:27:58

provide any tricky test case for case number 25


Added by:Paranoid Android
Date:2010-03-09
Time limit:1s
Source limit:50000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Languages:All except: NODEJS OBJC PERL6 VB.NET
Resource:-