#include<fstream.h>


int main()
{
	ifstream fin("cifra.in");
	ofstream fout("cifra.out");
	long n,t;
	fin>>t;
	long i=0,j=0,s=0;
	for (i=0;i<=t;i++)
	{
		s=0;
		fin>>n;
		for (j=1;j<n;j++)
		{
		int a,b;
		a=j%10;
		if (j>10)
		b=(j%100)%4;
		else
		b=j%4;
		if (b==0) 
		s=s+a*a*a*a;
		if (b==1)
		s=s+a;
		if (b==2)
		s=s+a*a;
		if (b==3)
		s=s+a*a*a;
		s=s%10;
		}
		fout<<s<<'\n';
	}
	fin.close();
	fout.close();
	return 0;
}