#include <bits/stdc++.h>
using namespace std;

int main() {
  long n,m,s=0;
  cin >> n >> m;
  vector<long> a(n);
  for(int i=0;i<n;i++) {
    cin >> a[i];
    s+=a[i];
  }
  sort(a.begin(),a.end());
  if(a[n-m]*4*m>=s) cout << "Yes" << endl;
  else cout << "No" << endl;
}