#include <fstream>
using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
int i,j,s,n,k,t,p;
int main()
{
    f>>t;
    for (i=1;i<=t;i++)
    {
        f>>n;
        s=0;
        for(j=1;j<=n;j++)
        {
            p=1;
            for (k=1;k<=j;k++)
                p=(p*j)%10;
            s=(s+p)%10;
        }
        g<<s<<'\n';
    }
    return 0;
}