#include <iostream>
#include <fstream>
#include <cmath>
using namespace std;
int t,v[1000],s,j,i;
int main()
{
    ifstream f("cifra.in");
    ofstream g("cifra.out");
    f>>t;
    for (i=1;i<=t;i++)
    {
        s=0;
        f>>v[i];
        for (j=1;j<=v[i];j++)
        {
            s=s+pow(j,j);
        }
        g<<s%10<<"\n";
    }
    return 0;
}