#include <bits/stdc++.h>

using namespace std;

long maximumValue(vector <int> a) {
    // Return the maximum value of f among all subsegments [l..r].
    return(gcd(for(int l=0;l<=r;l++){a[l];}))
}

int main() {
    int n;
    cin >> n;
    vector<int> a(n);
    for(int a_i = 0; a_i < n; a_i++){
       cin >> a[a_i];
    }
    long result = maximumValue(a);
    cout << result << endl;
    return 0;
}