#include <iostream>
using namespace std;
int gcd(int a, int b) {
    return (a == 0) ? b: gcd(b % a, a);
}

int main() {
	int n, m = 0;
	cin >> n;
	for (int i = 0; i < n; i++) {
		int a;
		cin >> a;
		m = gcd(m, a);
	}
	cout << m;
	return 0;
}