#include <iostream>
#include <fstream>
#include <cmath>

using namespace std;

int main()
{
    ifstream f("cifra.in");
    ofstream g("cifra.out");
    long long T,N,i,j,s;
    f>>T;
    for(i=1;i<=T;i++)
    {
    f>>N;s=0;
    for(j=1;j<=N;j++)
      s=s+pow(j,j);
    g<<s%10<<"\n";
    }
}