#include<fstream.h>
#include<math.h>
unsigned long n,t,S,i,j;
int main()
{
ifstream f("cifra.in");
ofstream g("cifra.out");
f>>t;
for (i=0;i<t;i++) {f>>n;
		   S=0;
		   for (j=1;j<=n;j++) S=S+pow(j,j);
		   g<<S%10<<'\n';}
f.close();
g.close();
return 0;
}