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

是给残疾人抄的