using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;
class Program
{
    static ulong NN => ulong.Parse(ReadLine());
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var t = (int)NN;
        var ans = new ulong[t];
        for (var u = 0; u < t; ++u)
        {
            var n = NN;
            if (n == 0)
            {
                ans[u] = 2;
                continue;
            }
            ulong mul = 1;
            ulong en1 = 0;
            for (ulong i = 0; i <= n; ++i)
            {
                en1 += mul;
                mul = mul * (n - i) % 10;
                if (mul == 0) break;
            }
            ans[u] = en1 % 10;
        }
        WriteLine(string.Join("\n", ans));
    }
}