#include <iostream>
using namespace std;
int cmmdc2(int x, int y)
{
    int r;
    while(y)
    {
        r=x%y;
        x=y;
        y=r;
    }
    return x;
}
int cmmdc(int v[],int a,int b)
{
    int r;
    while(b)
    {
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}
int divimp(int v[],int st,int dr)
{
    if(st==dr)
        return v[st];
    else
    {
        int m=(st+dr)/2;
        int cm1=cmmdc(v,st,m);
        int cm2=cmmdc(v,m+1,dr);
        return cmmdc2(cm1,cm2);
    }
}
int main()
{
    int n,i,v[1001];
    cin>>n;
    for(i=1; i<=n; i++)
        cin>>v[i];
    cout<<divimp(v,1,n);
    return 0;
}