#include <stdio.h>
 
int main(){
  long N,count=0,i;
  double a[N];
  double sum=0,M;
  scanf("%ld %lf",&N,&M);
  for(i=0;i<N;i++){
    scanf("%lf",&a[i]);
    sum+=a[i];
  }
  for(i=0;i<N;i++){
    double b=a[i]/sum;
    double c=1/(4*M);
    if(b>=c){
      count++;
    }
  }
  if(count>=M){
    printf("Yes");
  }else{
    printf("No");
  }
}
