（x=4*5,x*5),x+25

#include<bits/stdc++.h>
using namespace std;

double F(double x, double y) {
    return 6*pow(x,7) + 8*pow(x,6) + 7*pow(x,3) + 5*pow(x,2) - y*x;
}

double f(double x) {
    return 42*pow(x,6) + 48*pow(x,5) + 21*pow(x,2) + 10*x;
}

int main() {
    int t;
    double y, l, h, mid;
    cin >> t;
    while(t--) {
        cin >> y;
        l = 0.0;
        h = 100.0;
        while(h - l > 1e-7) {
            mid = (l + h) / 2;
            if(f(mid) < y)
                l = mid;
            else
                h = mid;
        }
        printf("%0.4lf\n", F(mid, y));
    }
    return 0;
}