#include <fstream>
using namespace std;
ifstream in("cifra.in");
ofstream out("cifra.out");
void cifra(int n)
{
    int s=0,r=1,c,ci;
    for(int i=1;i<=n;i++)
        {
            r=1;
            ci=i;
            while(ci>0)
                {
                    r=r*i;
                    ci--;
                }
            s=s+r;
        }
    c=s%10;
    out<<c<<"\n";
}
int main()
{
    int t,nc;
    char n;
    in>>t;
    for(int i=1;i<=t;i++)
        {
            in>>n;
            nc=n-'0';
            cifra(nc);
        }
    out.close();
    in.close();
    return 0;
}