#include <fstream>
#include <iostream>
using namespace std;
ifstream fin("cifra.in");
ofstream fout("cifra.out");
int main()
{
    int t,i,S=0,j,P=1;
    fin>>t;
    while(fin>>i &&t>=1&&t<=30000)
    {

      for(j=1;j<=i;j++) P=P*i;
      S=S+P;
      P=1;
      fout<<S%10<<endl;
    }
    fin.close();
    fout.close();
    return 0;
}