#include <iostream>
#include <fstream>
using namespace std;
int n,suma,t,me=1;
int main()
{
    ifstream f("cifra.in");
    ofstream g("cifra.out");
    f>>t;
    for(int i=1;i<=t;i++)
    {

        f>>n;
        for(int s=1;s<=n;s++)
        {
           for(int r=1;r<n;r++)
           {
                me=me*n;
                me=me%10;
           }
            suma=suma+me;
            suma = suma %10;
            me=1;

        }
     g<<suma%10<<"\n";
    }
    f.close();
    g.close();
    return 0;
}