#include <cmath>
#include <fstream>
#include <iostream>
using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
int calcLast(int x) {
    if (x == 0) return 0;

    return pow(x, x) + calcLast(x - 1);
}

int main() {
    int n, x;

    f >> n;

    for (int i = 1; i <= n; i++) {
        f >> x;
        g << calcLast(x) % 10 << endl;
    }

    f.close();
    g.close();
}