#include <iostream>
#include <cmath>
using namespace std;

int main()
{
    int n, v[30000];
    cin >> n;
    for (int i = 0; i < n; ++i)
        cin >> v[i];
    for (int i = 0; i < n; ++i)
    {
        int sum = 0;
        for (int j = 1; j <= v[i]; ++j)
        {
            sum += pow(j, j);
        }
        cout << sum % 10 << '\n';
        cout.flush();
    }
    return 0;
}