#include<iostream>
using namespace std;
int gcd(int a, int b)
{
if (b == 0)return a;
else return gcd(b, a % b);
}
int main()
{
int n; cin >> n;
int a[10000] = { 0 };
for (int i = 0; i < n; i++)
cin >> a[i];
int g = gcd(a[0],a[1]);
for (int i = 2; i < n; i++)
{
g = gcd(g, a[i]);
}
cout << g;
return 0;
}

#include <iostream>
using namespace std;
int main()
{
long long x,x1,x2,x3,b;
cin>>x;
cin>>x1;
cin>>x2;
while(1)
{
long long r=x1%x2;
if(r==0)
break;
x1=x2; x2=r;

}
for(long long y=1; y<x-1; y++)
{
cin>>x3;
while(1)
{
long long k=x3%x2;
if(k==0)
break;
x3=x2; x2=k;

}
}
cout<<x2<<endl;
return 0;
}