#include <iostream>
#include <fstream>
using namespace std;
ifstream in("cifra.in");
ofstream out("cifra.out");
int main()
{
    int t;
    in >> t;
    for(int i = 1; i <= t; i ++)
    {
        string x;
        in >> x;
        int n = (x[x.size() - 1] - '0');
        int s = 0;
        for(int j = 1; j <= n % 10; j ++)
        {
            int t = 1;
            for(int h = 1; h <= j; h ++)
                t = (t * j) % 10;
            s += t;
            s = s % 10;
        }
        if(x.size() % 2 == 0)
            s += 5;
        out << s % 10 << '\n';
    }
    return 0;
}