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