#include<stdio.h>
#include <math.h>

main(void)
{
  int N,M,i,counter,sum=0;
  int A[1000];
  
  scanf("%d %d",&N,&M);
  for(i=0;i<=N;i++)
  {
    scanf("%d",&A[i]);
    sum+=A[i];
  }
  

  for(i=0;i<=N;i++)
  {
    if(A[i]>=sum/(4*M))
    {
      counter++;
    }
  }
  
  if(M<=counter && M<=N)
  {
    printf("Yes");
  }
  
  else
  {
    printf("No");
  }

  return 0;
}
