#include <iostream>
using namespace std;
int main() {
	int n , a = -1, b = 1000000005, x;
	cin >> n;
	for(int i = 1; i <= n ; i ++)
	{
		cin >> x;
		if(x > a)
			a = x;
		if(x < b)
			b = x;
	}
	while(b)
	{
		int r = a % b;
		a = b;
		b = r;
	}
	cout << a << endl;
    return 0;
}