#include <iostream>
#include <fstream>
#include <cmath>
using namespace std;
ifstream f;
ofstream g;
int main()
{
	f.open("cifra.in");
	g.open("cifra.out");
	long long int x,n,t,nr=0,i,j,a,c;
	f >> t;
	for (a = 1; a <= t;a++)
	{
		f >> n;
		for (i = 1; i <= n; i++)
		{
			x = 1;
			for (j = 1; j <= i; j++)
			{
				x = x*i;
				x = x% 10;
			}
			x = x % 10;
			nr = nr + x;
			
		}
		c = nr % 10;
		g << c<< endl;
		nr = 0;
	}	
	f.close();
	g.close();
	return 0;
}