// A+B.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include <iostream>
#include <fstream>
using namespace std;

int main()
{
	ifstream in("cifra.in");
	ofstream out("cifra.out");
	long long int n, nr,S=0,putere,i,j;
	cin >> n;
	while (n != 0) {
		S = 0;
		n--;
		cin >> nr;
		for (i = 1; i <= nr; i++) {
			putere = 1;
			for (j = 1; j <= i; j++) {
				putere *= i;
			}
			S += putere % 10;
		}
		cout << S << endl;
	}
	
}

// Run program: Ctrl + F5 or Debug > Start Without Debugging menu
// Debug program: F5 or Debug > Start Debugging menu

// Tips for Getting Started: 
//   1. Use the Solution Explorer window to add/manage files
//   2. Use the Team Explorer window to connect to source control
//   3. Use the Output window to see build output and other messages
//   4. Use the Error List window to view errors
//   5. Go to Project > Add New Item to create new code files, or Project > Add Existing Item to add existing code files to the project
//   6. In the future, to open this project again, go to File > Open > Project and select the .sln file