#include <fstream>
#include <math.h>
using namespace std;

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


int t, u;

double n;

int main()
{   f >> t;
    for (int i=1; i<=t; i++)
    {   u=0;
        f >> n;
        for (double j=1; j<=n; j++)
            u=(u+static_cast<int>(pow(j, j)))%10;
        g << u << endl;
    }
    f.close();
    g.close();
    return 0;
}