#include <iostream>
#include <fstream>
#include <math.h>
using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
int n,i,S=0,c,j,v[100],k;
int main()
{
    f>>n;
    for (i=1; i<=n; i++)
        f>>v[i];
    for (i=1; i<=n; i++)
    {
        S=0;
        for (j=1; j<=v[i]; j++)
            S=S+pow(j,j);
        c=S%10;
        g<<c<<'\n';
    }
}