2
100
200

-74.4291
-178.8534

#include<iostream>
#include<stdio.h>
#include<math.h>
using namespace std;
double y;
double A(double x)
{
    return 42*pow(x,6)+48*pow(x,5)+21*pow(x,2)+10*x;
}
int main()
{

    int T;
    cin>>T;

    while(T--)
    {
        double low=0.0;
        double high=100.0;
        double mid;
        cin>>y;
        if(A(100)<y)
        {
            printf("%.4lf",6*pow(100,7)+8*pow(100,6)+7*pow(100,3)+5*pow(100,2)-y*100);
            continue;
        }

        while(low+1e-8<high)
        {
            mid=(low+high)/2.0;
            
            if(A(mid)>y)
                high=mid;
            else
                low=mid;
        }

        printf("%.4lf\n",6*pow(low,7)+8*pow(low,6)+7*pow(low,3)+5*pow(low,2)-y*low);
    }
    return 0;
}