#include<iostream>
#include<fstream>
long long a[30000],t,i,s,j,p;
using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
int main()
{
	f>>t;
	for(i=1;i<=t;i++)
		f>>a[i];
	for(i=1;i<=t;i++)
		{p=1;
		for(j=1;j<=a[i];j++)
		p=p*a[i]%10;
			s+=p%10;
			s=s%10;
		g<<s;
		g<<endl;}
g.close();
f.close();
return 0;
}