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