B - Popular Vote

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.

4 1
5 4 2 1

Yes

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

3 2
380 19 1

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.

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

Yes