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

int cmmdc(int a, int b)
{
    int t;
    while (b != 0)
    {
        t = b;
        b = a % b;
        a = t;
    }
    return a;
}
int a[101];

int main()
{
    int n;
    ifstream fin("cmmdc.in");
    fin>>n;
    for(int i=1; i<=n; i++)
        fin>>a[i];

    int d=cmmdc(a[1],a[2]);
    for(int i=3; i<=n; i++)
        d=cmmdc(d,a[i]);

    ofstream fout("cmmdc.out");
    fout<<d;

    return 0;
}