﻿ ABC161 B - Popular Vote - Atcoder

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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