#include <fstream>
#include <cmath>

using namespace std;

int main()
{
    ifstream in("cifra.in");
    ofstream out("cifra.out");
    int n;
    in >> n;
    for(int i = 0;i < n ;i++) {
        int temp;
        in >> temp;
        int sum = 0;
        for(int i = 1;i < temp + 1;i++) {
            int temp = pow(i, i);
            sum += temp;
        }
        out << sum % 10 << endl;
        sum = 0;
    }
    return 0;
}