#include<bits/stdc++.h>
using namespace std;
int main()
{
    int x,y,b,a,r;
    cin>>x>>y;
    a=y;
    for(int i=2;i<=x;i++)
    {
        cin>>y;
        b=y;
        r=a%b;
        while(r)
        {
            a=b;
            b=r;
            r=a%b;
        }
    }
    cout<<b;
    return 0;
}

#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;
}