#include <stdio.h>
int main(void){
  int m,n;
  int a[100];
  int i,sum=0,tmp=0;
  
  scanf("%d %d",&n,&m);
  
  for(i=0;i<n;i++){
    scanf("%d",&a[i]);
    sum+=a[i];}
  
  for(i=0;i<n;i++)
  	if(a[i]>=sum/(4*m)){
      tmp++;}
  
  if(tmp>=m)
    printf("Yes");
  else
    printf("No");
  
  return 0;
 
}