#include<iostream>
#include<fstream>
#include<stdio.h>
#include<stdlib.h>
#include<math.h>
using namespace std;
unsigned int t,n,i,s;
int main()
{
    ifstream f("cifra.in");
    ofstream g("cifra.out");
    f>>t;
    while(f>>n)
    {
        s=0;
        for(i=1;i<=n;++i)
        {
            s+=pow(i,i);
        }
        g<<s%10<<"\n";
    }

    f.close();   g.close();
    return 0;
}