#include <fstream.h>
#include <math.h>
unsigned int n, t, i, j;
unsigned long prod, suma=0;
void main()
{
ifstream f("cifra.in");
ofstream g("cifra.out");
f>>t;
for(i=1; i<=t; i++)
    {f>>n;
     for(j=1; j<=n; j++)
     {prod=pow(j,j);
     suma=suma+prod%10;}
     if(i!=t)
     g<<suma%10<<endl;
     else
     g<<suma%10;
     suma=0;
     }
f.close();
g.close();
}