#include <iostream>
#include <fstream>
#include <cmath>

using namespace std;

int main()
{
    ifstream in("cifra.in");
    ofstream out("cifra.out");
    int T,N,i,j;
    unsigned long S;
    in >> T;
    for (i=1; i<=T; i++){
        in >> N;
        S=0;
        for (j=1; j<=N; j++){
            S=S + pow(j,j);
            S=S%10;
        }
        out << S <<endl;
    }
    return 0;
}