#include <bits/stdc++.h>
using namespace std;
int n, a[111111];
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 = 2; i <= n; i++) {
    if (a[i] != a[i - 1] && a[i] < a[i - 1] * 2) {
      puts("YES");
      return 0;
    }
  }
  puts("NO");
  return 0;
}
