#include <iostream>
#include <cmath>

using namespace std;

int DingDong(int a , int b)
{
    while(b)
    {
        int r = a % b;
        a = b;
        b = r;
    }

    return a;
}
int main()
{
int n , x , y , z , max = 0 , div;

cin >> n;

for(int i = 1 ; i <= n ; i++)
{
    cin >> x;

        if(i == 1)
            div = x;

    div = DingDong(div , x);

}
cout << div;
}