#include <iostream>
#include <cmath>
#include <vector>

#define fore(i, l, r) for(int i = int(l); i < int(r); i++)
#define forn(i, n) fore(i, 0, n)


using namespace std;

int F(int n, int m){
        while(n != 0 && m != 0)
            if (n > m) n %= m;
            else m %= n;
    return n + m;
}


int main() {
    int n;
    cin >> n;
    int *a = new int[n];
    forn(i,n) {
        cin >> a[i];
    }
    int k = F(a[0], a[1]);
    for (int i = 2; i < n; i++)
        k = F(k, a[i]);
    cout << k;
}