#include <iostream>
#include <fstream>
#include <algorithm>
#include <math.h>
using namespace std;
ifstream in("cifra.in");
ofstream out("cifra.out");
int T,N,S,i,j;
int main()
{
    in>>T;
    for(i=1;i<=T;i++)
    {
        S=0;
        in>>N;
        for(j=1;j<=N;j++)
            S=S+pow(j,j);
        out<<S%10<<endl;
    }
    return 0;
}