// CF_TR4_B
#include <iostream>
#include <stdio.h>

using namespace std;

int gcd(int x, int y)
{
    if (x == 0) return y;
    else return gcd(y%x, x);
}

int main()
{
    int n;
    //cin >> n;
    scanf("%d", &n);
    int mas[101];
    for (int i = 0; i < n; i++)
        scanf("%d", &mas[i]);

    int ans = 0;

    for (int i = 1; i < n; i++)
        ans = gcd(mas[0], mas[i]);

    //cout << ans;
    printf("%d", ans);
    //system("pause");
    return 0;
}