#include <fstream>
#include <cstring>
///Varianta 1
using namespace std;

int U[100]; ///U[i] = Uc(1^1+2^2+...+i^i)

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

int ucif (int n) ///Ultima cifra a lui n^n
{
    int uc = n % 10,
        r = n % 4,
        p = 1;
    if (r == 0) r = 4;
    while (r--)
        p *= uc;
    return p % 10;
}

void precalcul()
{
    //U[0] = 0;
    for (int i = 1; i < 100; i++)
        U[i] = (U[i - 1] + ucif (i) ) % 10;
}

int main()
{
    int T, ncif, rest;
    char sir[101];
    precalcul();
    f >> T;
    while (T--)
    {
        f >> sir;
        ncif = strlen (sir);
        rest = sir[ncif - 1] - '0';
        if (ncif >= 2)
            rest += (sir[ncif - 2] - '0') * 10;
        g << U[rest] << '\n';
    }
    f.close();
    g.close();
    return 0;
}