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 JavaScript (node.js v5.12) (judge verdict: Accepted)

const main = (inputs) => {
  var array1 = inputs[0].split(" ");
  var array2 = inputs[1].split(" ");
  var N = array1[0];
  var M = array1[1];

  var sum = 0;
  array2.forEach((elm) => {
    sum += elm - 0;
  });

  var NGValue = sum / (4 * M);

  var sortArray = array2.filter(v => {
    return Number(v) >= Number(NGValue);
  });
  if (sortArray.length >= M && N > 0 && M > 0) {
    console.log('Yes');
  } else {
    console.log('No');
  }
}
main(require('fs').readFileSync('/dev/stdin', 'UTF-8').trim().split("\n"));