#include <iostream>
#include <fstream>
#include <cmath>
using namespace std;
int t,c,i,p;
long long n;
long putere(int x, int y) {
  p=1;
  for(i=1; i<=y; i++)
    p*=x;
  return p;
}
int z(int n)
{
    if(n==1)
        return 1;
    else
        return putere(n,n)+z(n-1);
}
int main()
{
    ifstream f("cifra.in");
    ofstream g("cifra.out");
    f>>t;
    while(t)
    {
        f>>n;
        g<<z(n)%10<<endl;
        t--;
    }
}