#include<fstream>
using  namespace std;
int main()
{
    ifstream in ("cifra.in");
    ofstream out ("cifra.out");
    int n, nrden, suma=0, i, UC, adunat=1,j;
    in>>nrden;
    while(nrden)
    {
        in>>n;
    for(i=1; i<=n; i++)
    {
        j=i;
        while(j)
        {
            adunat=adunat*i;
            j--;
        }
        suma=suma+adunat;
        adunat=1;
    }
    UC=suma%10;
    nrden--;
    out<<UC;
    suma=0;
}
}