#include <cmath>
#include <fstream>
using namespace std;
ifstream f("data.in");
ofstream g("data.out");
int n,t,t1,t2,t3,p,a,l;
int main()
{
    f>>n;
    while(l!=n)
    {
        f>>t;
            while(t>a)
            {t2=pow(t,t);
            t3=t3+t2;
            a++;
            if(t==a) g<<t3%10<<'\n';
            }
        l++;
    }
    return 0;
}