#include<iostream>
using namespace std;
int main()
{
int N,n;
cin>>N;
cin>>n;
int a=n,b,r;
for(int i=2;i<=N;i++)
{
cin>>n;
b=n;
r=a%b;
while(r)
{
a=b;
b=r;
r=a%b;
}
}
cout<<b;

return 0;
}