#include<fstream.h>
int main()
{long int n,t,i,p,k,s,j;
ifstream f("cifra.in");
ofstream g("cifra.out");
f>>t;
for (k=1; k<=t; k++)
	{f>>n; s=0;
	for (i=1; i<=n; i++)
		{p=1;
		for (j=1; j<=i; j++)
			p=(p*i)%10;
		s=(s+p)%10;
	g<<s;
	g<<"/n"; } }
f.close();
g.close();return 0;
					  }