#include <iostream>
#include <fstream>
#include <math.h>

using namespace std;
ifstream fin("cifra.in");
ofstream fout("cifra.out");

int main()
{
    int v[1005],i,t,j,x;
    long long S;
    double n;
    fin>>t;
    for (i=0;i<t;i++)
    {
        fin>>n;
        S=0;
        for (j=1;j<=n;j++)
            {x=pow(j,j);
            S=S+x;}
        fout<<" "<<S%10<<endl;
    }
    return 0;
}