using System;
using System.Numerics;
using System.Collections.Generic;
using System.IO;
using System.Text;
 
public class Solver
{
    public void Solve()
    {
      int n = ri;
      int[] l=new int[n],r=new int[n],a=new int[n];
      for(int i=0;i<n;i++){
        a[i]=ri;
      }
      l[0]=0;r[n-1]=0;
      for(int i=1;i<n;i++){
        l[i]=gcd(l[i-1],a[i-1]);
        r[n-i-1]=gcd(r[n-i],a[n-i]);
      }
      int p=0,g=0;
      for(int i=0;i<n;i++){
        g=gcd(l[i],r[i]);
        if(g>p)p=g;
      }
      Console.WriteLine(p);
    }
 
    int ri { get { return sc.Integer(); } }
    long rl { get { return sc.Long(); } }
    double rd { get { return sc.Double(); } }
    string rs { get { return sc.Scan(); } }
    public StreamScanner sc = new StreamScanner(Console.OpenStandardInput());
 
    private const long mod = 1000000007;
    long digit10(long n) { long p = 1; while (p <= n) { p *= 10; } return p % mod; }
    long abs(long n) { return (n > 0) ? n : -n; }
    int gcd(int a, int b) { return (a == 0) ? b : gcd(b % a, a); }
    int lcm(int a, int b) { return a * b / gcd(a, b); }
    long max(params long[] n) { long p = n[0]; for (long i = 1; i < n.Length; i++) { p = (p > n[i]) ? p : n[i]; } return p; }
    long min(params long[] n) { long p = n[0]; for (long i = 1; i < n.Length; i++) { p = (p < n[i]) ? p : n[i]; } return p; }
    void YN(bool t) { Console.WriteLine(t ? "YES" : "NO"); }
    void Yn(bool t) { Console.WriteLine(t ? "Yes" : "No"); }
    void yn(bool t) { Console.WriteLine(t ? "yes" : "no"); }
    string clip(string s, int start, int count)
    {
        if (start + count < s.Length) { s = s.Remove(start + count); }
        if (start > 0) { s = s.Remove(0, start); }
        return s;
    }
}
 
static class Program
{
    static public void Main(string[] args)
    {
        Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false });
        var solver = new Solver();
        solver.Solve();
        Console.Out.Flush();
    }
 
    static BigInteger power(BigInteger b, BigInteger p)
    {
        BigInteger t = b;
        BigInteger q = 1;
        while (p > 0)
        {
            if (p % 2 == 1) q *= t;
            t *= t;
            p -= p % 2;
            p /= 2;
        }
        return q;
    }
}
 
public class StreamScanner
{
    public StreamScanner(Stream stream) { str = stream; }
    private readonly Stream str;
    private readonly byte[] buf = new byte[1024];
    private int len, ptr;
    public bool isEof = false;
    public bool IsEndOfStream { get { return isEof; } }
    private byte read()
    {
        if (isEof) throw new EndOfStreamException();
        if (ptr >= len)
        {
            ptr = 0;
            if ((len = str.Read(buf, 0, 1024)) <= 0)
            {
                isEof = true;
                return 0;
            }
        }
        return buf[ptr++];
    }
    public char Char()
    {
        byte b = 0;
        do b = read();
        while (b < 33 || 126 < b);
        return (char)b;
    }
    public string Scan()
    {
        var sb = new StringBuilder();
        for (var b = Char(); b >= 33 && b <= 126; b = (char)read())
            sb.Append(b);
        return sb.ToString();
    }
    public long Long()
    {
        long ret = 0; byte b = 0; var ng = false;
        do b = read();
        while (b != '-' && (b < '0' || '9' < b));
        if (b == '-') { ng = true; b = read(); }
        for (; true; b = read())
        {
            if (b < '0' || '9' < b)
                return ng ? -ret : ret;
            else ret = ret * 10 + b - '0';
        }
    }
    public int Integer() { return (int)Long(); }
    public double Double() { return double.Parse(Scan()); }
}

Measured memory_bytes: 12000