#include<iostream.h>
#include<fstream.h>
int main()
{int i=1,s=0,j=1;
unsigned long int t,b,d;
ifstream f("cifra.in");
ofstream g("cifra.out");
f>>t;
while(i<=t)
{
f>>b;d=b;
	while(j<b)
	{
	d*=b;
	j++;
	}
s+=d;
g<<s%10<<endl;
i++;
j=1;
}
f.close();
g.close();
return 0;
}