#include <iostream>
#include <fstream>
using namespace std;
int t,n,p=1,i,s,j;
int main()
{   ifstream f("cifra.in");
    ofstream fout("cifra.out");
    f>>t;

    for(j=1;j<=t;j++){f>>n;
     for(i=1;i<=n;i++){
     p=p*n;
     }s=s+p;
     fout<<s%10<<endl;
     p=1;
     }
    f.close ();
    fout.close ();

    return 0;
}