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

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

int putere(int n)
{
    int s = 0;
    for(int i = 1;i <= n;i++)
    {
        s += pow((i % 10),i);
    }
    return s%10;
}

int main()
{
    int i,n,m;
    f>> n;
    for(i = 1;i <= n;i++)
    {
        f>>m;
        g<<putere(m)<<'\n';
    }
    return 0;
}