#include <iostream>
using namespace std;
int find(int yi,int er){
    //cout<<yi<<" "<<er<<endl;
    if(yi%er==0){
        return er;
    }else{
        return find(er,yi%er);
    }
}
int main()
{
    int n,last;
    cin>>n;
    cin>>last;
    for(int i=1;i<n;i++){
        int now;
        cin>>now;
        if(last<now){
            int cg=last;
            last=now;
            now=cg;
        }
        last=find(last,now);
    }
    cout<<last;
}