#include <fstream>
#include <iostream>
using namespace std;
int main()
{
    int n, nr, ucif=0, suma=1, i, j, k;
    ifstream fin("cifra.in");
    ofstream fout("cifra.out");
    fin >> n;
    for(i=1;i<=n;i++)
    {
        fin >> nr;
        for(j=1;j<=nr;j++)
        {
                for(k=1;k<=j;k++)
                {
                    suma = suma * j % 10;
                }
                ucif = ucif + suma % 10;
                suma = 1;
        }
        ucif = ucif % 10;
        fout << ucif << endl;
        ucif = 0;
    }
    fin.close();
    fout.close();
    return 0;
}