#include <fstream>
using namespace std;

ifstream in("cifra.in");
ofstream out("cifra.out");

int ucf[]={0,1,4,7,6,5,6,3,6,9};

int main()
{
	
	int n,sum,i,a,b,j,t,k;
	in>>t;
	for(k=1;k<=t;k++)
	{
		sum=0;
		in>>n;
		a=0;
		for(i=1;i<=n;i++)
		{
			b=1;
			for(j=1;j<=i;j++)
				b=(b*i)%10;
			a=(a+b)%10;
		}
		out<<a<<"\n";
	}
	return 0;
}