#include<fstream>
#include<string>
#include<math.h>
std::ifstream fin("cifra.in");
std::ofstream fout("cifra.out");

int main() {
	int t,i;
	fin >> t;
	std::string nr;
	long suma;
	for (i = 1; i <= t; i++)
	{
		fin >> nr;
		suma = 0;
		for (int j = 1; j <= std::stoi(nr); j++) {
			suma += pow(j, j);
		}
		fout << suma % 10<<"\n";
	}
	return 0;
}