#include <iostream>
#include <fstream>

using namespace std;

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

int n,b;

int putere(int b, int e)
{
    int p=1;
    while(e)
    {
        if(e%2==1)
            p=p*b;
        b=b*b;
        e/=2;
    }
    return p;
}

int main()
{
    f>>n;
    for(int i=1; i<=n; i++)
    {
        int s=0;
        f>>b;
        for(int j=1; j<=b; j++)
        {
            s+=putere(j,j);
        }
        g<<s%10<<'\n';
    }
    return 0;
}