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

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

void prob(int a)
{
    if(a == 1)
        g<<1<<"\n";
    else{
            int current =0;
        for(int i=1;i<=a;i++)
        {
            current = current + pow(i,i);
        }
        g<<current%10<<"\n";
    }
}
int main()
{
    int T;
    int a;
    f>>T;
    for(int i=1;i<=T;i++)
    {
        f>>a;
        prob(a);
    }

    return 0;
}