#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, a[100005], i;
  cin >> n;
  for (i = 1; i <= n; i++) cin >> a[i];
  sort(a + 1, a + n + 1);
  for (i = 1; i < n; i++) {
    if (a[i + 1] < a[i] * 2 && a[i] != a[i + 1]) {
      cout << "YES";
      return 0;
    }
  }
  cout << "NO";
  return 0;
}
