#include <iostream>
#include <cstdio>
using namespace std;

int v[1001];
int cmmdc (int a , int b)
{
  while (b!=0)
  {
    int aux = a%b;
    a=b;
    b=aux;
  }
  return a;
}
int DivImp (int st , int dr)
{
  if (st-dr<=1)
   return cmmdc(v[st],v[dr]);
  else
  {
    int mij=(dr+st)/2;
    return cmmdc(DivImp(st,mij),DivImp(mij+1,dr));
  }
}

int main()
{
 // freopen("hanoi.in","r",stdin);
 // freopen("hanoi.out","w",stdout);

  int n;
    cin>>n;
    for (int i=1 ; i<=n ; i++)
      cin>>v[i];
    cout<<DivImp(1,n);
    return 0;
}