#include <fstream>
#include <iostream>
using namespace std;
ifstream f_in("cifra.in");
ofstream f_out("cifra.out");
unsigned long c(int x)
{
	unsigned long p = 1;
	for (int i=1;i<=x;i++) p *= x;
	return p;
}
int main()
{
	int T,i,j;
	char X[201];
	long x;
	unsigned long s;
	f_in>>T;
	for (i=1;i<=T;i++) 
	{
		f_in>>X;
		x = atol(X);
		s = 0;
		for (j=1;j<=x;j++) s += c(j);
		f_out<<s%10<<endl;
	}
	return 0;
}