#include <iostream>
#include <fstream>

using namespace std;

int main()
{
    ifstream in("cifra.in");
    ofstream out("cifra.out");
    int t,n,i,s,j,d,sa;
    in >> t;
    for (i=1;i<=t;i++)
    {
        s=0;
        in >> n;
        for (j=1;j<=n;j++){
            sa=1;
            for (d=1;d<=j;d++)
                sa=sa*j;
            s=s+sa;
        }

        out << s%10 << "\n";
    }
}