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 OCaml (4.10.0) (judge verdict: Accepted)

let cmp a b = 0-(a-b);;

Printf.printf "%s\n" @@
Scanf.scanf "%d %d\n" @@ fun n m ->
    let a = Array.init n @@ fun _ -> Scanf.scanf "%d " @@ fun i -> i in
    Array.sort (cmp) a;
    let sum = Array.fold_right ( + ) a 0 in
    let min = (sum+4*m-1)/(4*m) in
    let ans = ref "Yes" in
    for i = 0 to m-1 do
        if a.(i) < min then
            ans := "No";
    done;
    !ans