#include <iostream>
#include <fstream>
#include <cmath>
using namespace std;
int n,v[100],c=0,i,j;
int main()
{
    ifstream f("cifra.in");
    ofstream g("cifra.out");

    f>>n;
    for(i=1;i<=n;++i)
    f>>v[i];

    i=1;
    while(i<=n)
    {
    for(j=1;j<=v[i];++j)
    {
        c=c+pow(j,j);
    }
    g<<c%10<<"\n";
    c=0;
    ++i;
    }

    return 0;
}