#include <fstream.h>
#include <math.h>

ifstream fin("cifra.in");
ofstream fout("cifra.out");

int main()
{

	double t, n, s=0, i;

	fin>>t;

	for (i=1; i<=t; i++)
	{
	  fin>>n;
	  s = s+pow(n,n);
    fout<<(s%10)<<"\n";
	}
	
   fin.close();
   fout.close();
   return 0;
}