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