#include<stdio.h>

int main () 
{
  int m,n,i,score,check;
  int a[1001];
  
  scanf("%d %d",&n,&m);
  
  score=0;
  
  for (i=1;i<=n;i++)
  {
  scanf("%d",&a[i]);
  score+=a[i];   
  }
  
  check=0;
  for (i=1;i<=n;i++)
  {
	//printf("%f\n",(double) score / (4*m));
    if (a[i] >= (double) score / (4*m))
     {
       check+=1;
       
     }
  }
  
  if (check >= m )
  {
  printf("Yes");
    return 0;
  }
 
  printf("No");
  return 0;
}