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