#include <bits/stdc++.h>

using namespace std;

int gcd_(int a, int b)
{
    int c = a;
    while (b != 0)
    {
        a = b;
        b = c % a;
        c = a;
    }

    return a;
}

int main()
{
    int n, gcd;
    cin >> n;
    vector<int> a(n);
    for (int i = 0; i < n; i++)
    {
        cin >> a[i];
    }
    gcd = a[0];
    for (int i = 0; i < n; i++)
    {
        gcd = gcd_(a[i], gcd);
    }
    cout << gcd;
    return 0;
}