#include <iostream>
#include <fstream>
#include <cmath>

using namespace std;

ifstream in("cifra.in");
ofstream out("cifra.out");

int T;

int main()
{
    in >> T;
    for(int i=1; i<=T; i++)
    {
        long suma=0;
        int cifra, u;
        in >> cifra;
        for(int j=1; j<=cifra; j++)
            suma+=pow(j,j);
        u=suma%10;
        out << u <<"\n";
    }
    return 0;
}