"use strict";
function gcd(a) {
    var f = (a, b) => b ? f(b, a % b) : a;
    var ans = a[0];
    for (var i = 1; i < a.length; i++) {
        if (a[i] > 0) ans = f(ans, a[i]); 
    }
    return ans;
}
function Main(input) {
    let cin = new Inputer(input);
    let N = cin.getInt();
    let A = cin.getIntArray(N);
    let max = 0;
    for (let n = 0; n < N; n++) {
        let c = A[n]; A[n] = 0;
        let w = gcd(A);
        if (max < w) max = w;
        A[n] = c;
    }
    console.log(max);
}
class Inputer{constructor(t){if(typeof t=='undefined')throw new Error('引数（stdin）を省略できません！');this.cnt=0,this.items=t.split(/\n|\s/)}getInt(){return this.items[this.cnt++]-0}getIntArray(t){if(typeof t=='undefined')throw new Error('引数（1以上）を省略できません！');let r=new Array(t);for(let e=0;e<t;e++)r[e]=this.getInt();return r}getStr(){return this.items[this.cnt++]}getStrArray(t){if(typeof t=='undefined')throw new Error('引数（1以上）を省略できません！');let r=new Array(t);for(let e=0;e<t;e++)r[e]=this.getStr();return r}}
if (typeof window == "undefined") Main(require("fs").readFileSync("/dev/stdin", "utf8"));