#include <fstream>
#include <cmath>
using namespace std;
ifstream fin("cifra.in");
ofstream fout("cifra.out");
int main()
{
    double j,n,nr,i;
    int s;
    fin>>n;
    for(j=1;j<=n;j++)
    {
        fin>>nr;
        s=0;
        for(i=1;i<=nr;i++)
        {
            s=s+pow(i,i);
        }
        fout<<(double)(s%10)<<endl;
    }
    return 0;
}