#include <cmath>
#include <fstream>
#include <iostream>
using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
void calcLast(int x) {
    int sum = 0;
    for (int i = 1; i <= x; i++) {
        sum += pow(i, i);
    }
    g << sum % 10 << endl;
}

int main() {
    int n, x;

    f >> n;

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

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