#include <fstream>
#include <cmath>

using namespace std;

int cifra(long long int n)
{
    long long int suma=0,j;
    for(j=1;j<=n;j++)
    suma=suma+pow(j,j);
    return suma%10;
}

int main()
{
    ifstream f("cifra.in");
    ofstream g("cifra.out");
    long long int t,n,i;
    f>>t;
    i=1;
    while(i<=t)
    {
        f>>n;
        g<<cifra(n)<<endl;
        i++;
    }
    f.close();
    g.close();
    return 0;
}