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