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 C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace AtCoder_Core
{
    class Program
    {
        static void Main(string[] args)
        {
            var line1 = Console.ReadLine().Trim().Split(' ').Select(b => int.Parse(b)).ToArray();
            int N = line1[0];
            int M = line1[1];
            var A = Console.ReadLine().Trim().Split(' ').Select(c => int.Parse(c)).ToArray();
            Array.Sort(A);
            int selected = 0;
            for (int i = 0; i < A.Length; i++)
            {
                double lr = Math.Ceiling(((double)A.Sum() / (4.0 * (double)M)));
                if (A[i] >= lr)
                {
                    selected++;
                }
            }

            if (selected >= M)
            {
                Console.WriteLine("Yes");
            }
            else
            {
                Console.WriteLine("No");
            }
        }
    }
}