#include <bits/stdc++.h>
using namespace std;
int T, N;
int main()
{
    ifstream f("cifra.in");
    ofstream g("cifra.out");
    f >> T;
    for(int i = 1; i <= T; i++)
    {
        f >> N;
        int S = 0;
        for(int j = 1; j <= N; j++)
        {
            int x;
            x = j;
            int p = 1;
            for(int k = 1; k <= x; k++)
                p = p * x;
            S = S + p;
        }
        g << S % 10 << '\n';
    }
    return 0;
}