#include<stdio.h>
int main()
{
int n,m,i,sw;
float bo,m,sum;
  sum=0;
scanf("%d %f",&n,&m);
int a[n];
  
  for(i=0;i<n;++i)
  {
  scanf("%d",&a[i]);
  sum=sum+a[i];
  }
  bo=sum/(4*m);
  
  for(i=0;i<n;++i)
  {
  if(a[i]>=bo) sw++; 
  }
  
  if(sw>=m) printf("Yes");
  else printf("No");
return 0;
}