#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  ;
  int n;
  cin >> n;
  int arr[n];
  for (int i = 0; i < n; i++) cin >> arr[i];
  sort(arr, arr + n);
  int ok = 0;
  for (int i = 0; i < n - 1; i++) {
    if (((long long int)arr[i] * 2) > arr[i + 1] and arr[i + 1] > arr[i])
      ok = 1;
  }
  if (ok)
    cout << "YES" << '\n';
  else
    cout << "NO" << '\n';
}
