#include <iostream>
#include <cmath>
#include <fstream>
using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
int t, n, r, u;
int a[10][4]={
0,0,0,0,
1,1,1,1,
6,2,4,8,
1,3,9,7,
6,4,6,4,
5,5,5,5,
6,6,6,6,
1,7,9,3,
6,8,4,2,
1,9,1,9};

int main()
{
    f>>t;
    while(t--)
    {int s=0;
        f>>n;
        for(int i=1;i<=n;i++)
            s+=a[i%10][i%4];
        g<<s%10<<'\n';
    }
    return 0;
}