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

using namespace std;

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

    int n,a[100],i,s,j,r,t;
    f>>t;
    for (i=1; i<=t; i++)
        f>>a[i];
    for (i=1; i<=t; i++)
    {
        s=0;
        for (j=1; j<=a[i]; j++)
        {
            s=s+pow(j,j);
        }
        r=s%10;
        g<<r<<endl;
    }


    f.close();
    g.close();

    return 0;
}