#include<stdio.h>
 
int main(void)
{
  int N,M,A[100],a,j=0,sum=0;
  double c;

  scanf("%d",&N);
  scanf("%d",&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++;
 }
}

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