//#include <iostream>
#include <fstream>
#include <cmath>

std::ifstream is("cifra.in");
std::ofstream os("cifra.out");

int N, T, sum = 0;

int main()
{
    is >> T;
    for(int j = 1; j <= T; ++j)
    {
        sum = 0;
        is >> N;

        for(int i = 1; i <= N; ++i)
        {
            sum = sum + pow(i, i);
        }
        os << sum % 10 << '\n';
    }
    is.close();
    os.close();
    return 0;
}