#include <fstream>
using namespace std;
int T;
ifstream f("cifra.in");
ofstream g("cifra.out");
long putere(long x,int k)
{
    int p=1;
    for (int i = 1;i<=k;i++)
        p*=x;
    return p;
}
long long suma(int x)
{
    if (x == 1) return 1;
    return suma(x-1) + putere(x,x);
}
int main()
{
    int x;
    f>>T;
    for (int i=1;i<=T;i++)
    {
        f>>x;
        g<<suma(x)%10<<'\n';
    }
    f.close();
    g.close();
}