#include <iostream>
#include <cmath>
#include <fstream>
using namespace std;
unsigned int N,i,c,P,T,j,p;
unsigned long int L;
int main()
{
    ifstream f("cifra.in");
    ofstream g("cifra.out");
    f>>T;

    for(j=1;j<=T;j++)
    {
         f>>N;

    L=0;

    for(i=1;i<=N;i++)
    {
      L=L%10+pow(i%10,i);

    }

    c=L%10;
    g<<c<<endl;
    }
    return 0;


}