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