#include <iostream>
#include <fstream>
#include <cmath>
using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
int n,fake,nr,rez,T,a[30000];
int main()
{
    f>>T;
     for(int j=1;j<=T;j++)
    {
        f>>a[j];
        nr=0;
    for(int i=1;i<=a[j];i++)
    {
        fake=i;
        nr=nr+pow(fake,fake);
    }
    rez=nr%10;
    g<<rez<<"\n";
    }
    return 0;
}