#include<iostream>
#include<fstream>
#include<cmath>
using namespace std;
int main ()
{
    ifstream f("cifra.in");
    ofstream g("cifra.out");
    int t,n,s=0;
    f>>t;
    while(f>>n)
    {
        s=0;
        for(int i=1;i<=n;i++)
            s=s+pow(i,i);

    g<<s%10<<endl;}
    return 0;
}