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

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

int main()
{
    int n,x,i,p,j,y;
    f>>n;
    for(i=1;i<=n;i++)
    {
        f>>x;
        p=0;
        for(j=1;j<=x;j++)
            p=p+pow(j,j);
            y=p%10;
            g<<y<<"\n";
    }




    return 0;
}