#include <bits/stdc++.h>
using namespace std;
int n, a[200005];
int main() {
  scanf("%d", &n);
  for (int i = 0; i < n; ++i) scanf("%d", &a[i]);
  sort(a, a + n);
  for (int i = 1; i < n; ++i)
    if (a[i] > a[i - 1] && a[i - 1] > 1 && a[i] < 2 * a[i - 1]) {
      puts("YES");
      exit(0);
    }
  puts("NO");
  return 0;
}
