#include <fstream>
#include <cmath>
using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
int t,v[30001],s,i,j,p;
int main()
{
    f>>t;
    for(i=1;i<=t;i++)
    {
        s=0;
        f>>v[i];
        for(j=1;j<=v[i];j++)
        {
            p=pow(j,j);
            s+=p%10;
        }
        g<<s%10<<endl;
    }
    return 0;
}