#include <iostream>
#include <fstream>
using namespace std;
ifstream fin ("cifra.in");
ofstream fout ("cifra.out");
int n,numar,exponent,putere,suma;
int main()
{
  fin>>n;
    while(n)
    {
        fin>>numar;
        exponent=numar-1;
        putere=numar;
        while(exponent)
        {
            if(numar>10) numar%=10;
            numar*=putere;
            exponent--;
        }
        suma+=numar%10;
        if(suma>10) suma%=10;
        fout<<suma<<"\n";
n--;
    }
    return 0;
}