#include<iostream>
#include<fstream>
long long a,t,i,s,j,p;
using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
int main()
{
    f>>t;
   for(i=1;i<=t;i++)
        {f>>a;
    p=1;
        for(j=1;j<=a;j++)
         p=p*a%10;
            s=(s+p%10)%10;
            g<<s;
        g<<endl;
		}
g.close();
f.close();
return 0;
}