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

int NWD (int a, int b)
{
    int c;
    while (b)
    {
        c=a%b;
        a=b;
        b=c;
    }
    return a;
}

int main()
{
    int n, tmpNWD=0;
    cin >> n;
    vector <int> vec (n);
    for (int i=0; i<n; i++)
        cin >>vec [i];
    for (int i =0; i<n; i++)
        tmpNWD = NWD (vec[i], tmpNWD);
    cout <<tmpNWD;

    return 0;
}