#include <bits/stdc++.h>
using namespace std;
int main (){
	double b,c;
	int a[1001];
	cin >>b;
	for(int i=1;i<=b;i++){
		cin >>a[i];
	}
	for(int j=1;j<=b;j+=1){
		for(int s=1;s<=b;s+=1){
			if(a[j]%s==0){
				c=a[j];
			}
		}
	}
	cout <<c;
	return 0;
}