Problem:
Score : 200 points

Problem Statement

We have held a popularity poll for N items on sale. Item i received A_i votes.

From these N items, we will select M as popular items. However, we cannot select an item with less than \dfrac{1}{4M} of the total number of votes.

If M popular items can be selected, print Yes; otherwise, print No.

Constraints

1 \leq M \leq N \leq 100

1 \leq A_i \leq 1000

A_i are distinct.

All values in input are integers.

Input

Input is given from Standard Input in the following format:

N M
A_1 ... A_N

Output

If M popular items can be selected, print Yes; otherwise, print No.

Sample Input 1

4 1
5 4 2 1

Sample Output 1

Yes

There were 12 votes in total. The most popular item received 5 votes, and we can select it.

Sample Input 2

3 2
380 19 1

Sample Output 2

No

There were 400 votes in total. The second and third most popular items received less than \dfrac{1}{4\times 2} of the total number of votes, so we cannot select them. Thus, we cannot select two popular items.

Sample Input 3

12 3
4 56 78 901 2 345 67 890 123 45 6 789

Sample Output 3

Yes

Solution in PHP (5.6.30) (judge verdict: Wrong Answer)

<?php


 fscanf(STDIN,"%d %d",$N, $M);


 $A = explode(' ',trim(fgets(STDIN)));

 $match = 0;

 $need =  (4 * $M);
 $votes = 0;

 foreach($A as $num => $score){
 	$votes += $score;
 }

 $score = 0;
 $num = 0;



 foreach($A as $num => $score){
 	if($score < $score / $need){
 		continue;
 	}
 	$match++;
 }
 if($match >= $M){
 	printf("Yes");
 }else{
 	printf("No");
 }
 ?>