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

using namespace std;
int t, sum, n, i;
int main()
{
    ifstream fin("cifra.in");
    ofstream fout("cifra.out");
    fin >> t;
    while(fin >> n)
    {
        sum = 0;
        for(i = 1; i <= n; i++)
            sum += pow(i, i);
        fout << sum%10 << endl;
    }
    fin.close();
    fout.close();

    return 0;
}