#include <iostream>
#include <fstream>
using namespace std;
ifstream in ("cifra.in");
ofstream out ("cifra.out");
int main()
{
    int s=0, n, i, j, p, u, t, m;
    in>>t;
    for (m=1; m<=t; m++)
    {
        s=0;

        in>> n;

        for (i=1; i<=n; i++)
        {
            p=1;
            for (j=1; j<=i; j++)
            {
                p=p*i;
            }
            s=s+p;
        }
        u=s%10;
        out<<u<<endl;
    }
    return 0;
}