#include <fstream.h>
#include <math.h>
unsigned int n, t, a, i, j, k;
unsigned long prod=1, suma=0;
int main()
{
fstream f("cifra.in", ios::in);
ofstream g("cifra.out", ios::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;}
     g<<suma%10;
     suma=0;
     }
f.close();
g.close();
return 0;
}