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