#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <iomanip>

using namespace std;

const int S[] = {95, 90, 85, 80, 75, 70, 67, 65, 62, 60, 0};
const double V[] = {4.3, 4.0, 3.7, 3.3, 3.0, 2.7, 2.3, 2.0, 1.7, 1.0, 0.0};

double gpa(int v)
{
    for (int i = 0; i < 11; i++)
        if (v >= S[i])
            return V[i];
    return 0;
}

void work()
{
    int k;
    double ans = -1.0;
    cin >> k;
    for (int a = 0; a <= 100 && a + a + a + a <= k; a++)
        for (int b = a; b <= 100 && a + b + b + b <= k; b++)
            for (int c = b; c <= 100 && a + b + c + c <= k; c++) {
                int d = k - a - b - c;
                if (c <= d) {
                    ans = max(ans, gpa(a) + gpa(b) + gpa(c) + gpa(d));
                }
            }
    cout << fixed << setprecision(1) << ans << endl;
}

int main()
{
    ios::sync_with_stdio(false);
    int T;
    cin >> T;
    while (T--)
        work();

    return 0;
}