#include <iostream>
#include <cmath>
#include <fstream>
using namespace std;

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

int main()
{
    int n, i, x, s = 0, nr = 1;
    fin >> n;
    for(i = 1; i <= n; i++)
    {
        cin >> x;
        s = 0;
        nr = 1;
        while(nr <= x)
        {
            s = s + pow(nr, nr);
            nr++;
        }
        fout << s % 10 << endl;
    }
    return 0;
}