#include<iostream.h>

void main()

{
int a,b,d,n,nr,x,r,i;
cout<<"n:";
cin>>n;
cout<<"nr:";
cin>>d;
for(i=2;i<=n;i++)
{
cout<<"x:";
cin>>x;
b=x;
a=d;
while(b)
{
r=a%b;a=b;b=r;
}
d=a;
}
cout<<d;
}