#include <iostream>
#include <fstream>
#include <stdlib.h>

using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");

int uc[21] = {1,4,7,6,5,6,3,6,9,0,1,6,3,6,5,6,7,4,9,0};

int main()
{
    int t,i,j,s,n;
    char N[100000];

    f>>t;
    for(i=0; i<t; i++)
    {
        f>>N;
        n=atoi(N);
        s=0;
        for(j=0;j<n;j++)
        {
            s+=uc[j];
        }
        g<<s%10<<"\n";
    }
    return 0;
}