#include<bits/stdc++.h>

using namespace std;

int main()
{
  int n,m;
  cin>>n>>m;

  int sum=0,a[n];
  for(int i=0;i<n;i++)
  {cin>>a[i];
     sum=sum+a[i];}

  float d=sum/(float)(4*m);

  sort(a,a+n);

  if(a[n-m]>=d)
  cout<<"Yes";
  else
  {
   cout<<"No";
  }
  
 
  return 0;

}