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

int main(){
  int N, M;
  int A[110];
  cin >> N >> M;
  for (int i = 0; i < N; ++i) cin >> A[i];
  sort(A, A + N, greater<int>());
  int sum = accumulate(A, A + N, 0);
  if(A[M-1]*4*M < sum)cout << "No" <<endl;
  else cout << "Yes" << endl;
 
}
