#include <fstream>
using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
int main ()
{
	int t,x,s,n,i,j;
	f>>t;
	while (f>>x)
	{
	s=0;
	for(i=1;i<=x;i++)
	{
	n=1;
	for(j=1;j<=i;j++)
	{n=n*i;
	}
	s=s+n;
	}
	g<<s%10<<"\n";
	}
}