#include <bits/stdc++.h>
using namespace std;
inline long long read() {
  long long x = 0;
  bool f = false;
  char c = getchar();
  while (c < '0' || c > '9') {
    if (c == '-') f = true;
    c = getchar();
  }
  while (c >= '0' && c <= '9') {
    x = (x << 3) + (x << 1) + (c ^ '0');
    c = getchar();
  }
  return f ? -x : x;
}
inline void write(long long x) {
  if (x < 0) putchar('-'), x = -x;
  if (x > 9) write(x / 10);
  putchar(x % 10 + '0');
}
const long long N = 1e5 + 10;
long long n, a[N];
signed main() {
  n = read();
  for (register long long i = 1; i <= n; ++i) a[i] = read();
  sort(a + 1, a + n + 1);
  for (register long long i = 1; i <= n; ++i) {
    if (a[i] == 1) continue;
    register long long now = lower_bound(a + 1, a + n + 1, 2 * a[i]) - a - 1;
    if (a[now] > a[i]) return cout << "YES", 0;
  }
  cout << "NO";
  return 0;
}
