#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, a[100001];
  bool flg = 0;
  cin >> n;
  for (int i = 0; i < n; i++) cin >> a[i];
  sort(a, a + n);
  for (int i = 1; i < n; i++)
    if (a[i] > a[i - 1] && a[i - 1] * 2 > a[i]) flg = 1;
  if (flg == 1)
    cout << "YES";
  else
    cout << "NO";
  return 0;
}
