#include<stdio.h>
int main(void)
{
  int N,i,M;
  scanf("%d %d",&N,&M);
  int A[N],sum=0,number=0;
  
  for(i=0;i<N;i++)
  {
  scanf("%d",&A[i]);
    sum=+A[i];
  }
  
  for(i=0;i<N;i++)
  if(sum<=A[i]*4*M)
    number++;
  
  if(number<M)
    printf("No\n");
  else
    printf("Yes\n");
  return 0;
}