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