#include <iostream>
#include <fstream>
#include <math.h>

using namespace std;

int main()
{
    ifstream in("cifra.in");
    ofstream out("cifra.out");
    double t,n,i,s,j;
    int a;
    in >> t;
    for (i=1;i<=t;i++)
    {
        s=0;
        in >> n;
        for (j=1;j<=n;j++)
            s=s+pow(j,j);
        a=s;
        out << a%10 << "\n";
    }
}