#include <fstream>
#include <cmath>

using namespace std;

int main()
{
    ifstream f("cifra.in");
    ofstream g("cifra.out");
    int n , j , k , i,x,S=0,cnt;
    f >> n;
    for (i=1;i<=n;i++)
    {
        f >> x;
        for (j=1;j<=x;j++)
        {
            cnt=1;
            for (k=1;k<=j;k++)
                {
                    cnt=cnt*j;
                    cnt=cnt%10;
                }
            S=S+cnt;
        }
    S=S%10;
    g << S << '\n';
    S=0;
    }
}