#include <iostream>
#include <fstream>
#include <math.h>
using namespace std;

int main()
{
    ifstream fin("cifra.in");
    ofstream fout("cifra.out");
    int i,n,t,j,s=0,y;
    fin>>t;
    for(j=1;j<=t;++j)
    {
        fin>>n;
        for(i=1;i<=n;++i)

            s=s+pow(i,i);
        s=s%10;
            fout<<s<<"\n";
    }
    fin.close();
    fout.close();
    return 0;
}