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

using namespace std;
ifstream fin("cifra.in");
ofstream fout("cifra.out");

int main()
{
    long long N, T, sum = 0;
    fin >> T;
    for (int i = 0; i < T; i++)
    {
        fin >> N;
        for (int i = 0; i < N; i++)
            sum += pow(i+1, i+1);
        fout << sum % 10 << endl;
        sum = 0;
    }
    return 0;
}