#include<stdio.h>
 
int main(void)
{
  int N,M,A[1000],a,b,j=0,sum=0;
  double c;

  scanf("%d %d",&N,&M);
  for(a=0;a<N;a++){
	scanf("%d ",&A[a]);
	sum+=A[a];
}

  c=sum/(4*M);
  for(a=0;a<N;a++){
	if(c<=A[a]){
		j=1;
		a=N;
 }
}

  if(j)
    printf("Yes");
  else
    printf("No");
  
  return 0;
}