#include <stdio.h>
int main(void){
  int n,m,i,num=0;
  int vote[1000];
  double x = 0;
  scanf("%d %d",&n,&m);
  for(i = 0; i < n; i++){
    scanf("%d",&vote[i]);
    x += vote[i];
  }
  x = x/(4*m);
  for(i = 0; i < n; i++){
    if(vote[i] >= x)
      num++;
  }
  if(num >= m)
    printf("Yes\n");
  else
    printf("No\n");
  return 0;
}
