#include<fstream>
#include<math.h>
using namespace std;
ifstream fin("cifra.in");
ofstream fout("cifra.out ");
unsigned n,s, t;
int suma(unsigned x)
{ unsigned s=0;
  for(unsigned j=1;j<=x;j++)
	  s+=pow(j,j);
 return s;
}
int main()
{ fin>>t;
  for(unsigned long long i=0;i<t;i++)
	{
		fin>>n;
		fout<<suma(n)%10<<"\n";
    }
return 0;
}