#include <stdio.h>

int main()
{
  int n,m,total,count;
  scanf("%d%d",&n,&m);
  int li[1001];
  for (int i = 0;i < n;i++)
  {
    scanf("%d",&li[i]);
    total += li[i];
  }
  for (int i = 0;i < n;i++)
    if (li[i] >= 1/(4*m)*total)
      count += 1;
  if (count >= m)
    print("Yes");
  else
    print("No");
  