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.

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.

Constraints

• $1 \leq M \leq N \leq 100$
• $1 \leq A_i \leq 1000$
• A_i are distinct.
• All values in input are integers.

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

见题面 Input 部分

见题面 Output 部分