#include <stdio.h>
 
int main() {
  int n,m,i,total=0,a[1000],c=0;
  scanf("%d %d",&n,&m);
  for (i=0;i<n;i++){
    scanf("%d",&a[i]);
    total=total+a[i];
  }
  double p = (double)total/(double)(4*m);
  for (i=0;i<n;i++){
    if (a[i]>=p){
      c=c+1;
    }
  }
  if(c>=m){
    printf("Yes");
  }
  else{
     printf("No");
    }
  return 0;
}