#include <fstream>
using namespace std;
ifstream

in ("euclid2.in");
ofstream out ("euclid2.out");
int main()
{int a, b, n, r, i;
    in >> n;

        in >> a >> b;
        while (b>0)
            {
            r = a % b;
            a = b;
            b = r;
        }
        out << a ;

    return 0;
}