# include <iostream>

 # include <cstdio>

 # include <cmath>

 using namespace std;

 const double eps=1e-;

 double Y;

 int sgn(double x)

 {

     if(fabs(x)<eps) return ;

     if(x>) return ;

     else return -;

 }

 double F(double x)

 {

     return 6.0*pow(x,)+8.0*pow(x,)+7.0*pow(x,)+5.0*pow(x,)-Y*x;

 }

 double f(double x)

 {

     return 42.0*pow(x,)+48.0*pow(x,)+21.0*pow(x,)+10.0*x-Y;

 }

 void Solve()

 {

     scanf("%lf",&Y);

     double l=;

     double r=;

     while(r-l>eps)

     {

         double mid=l+(r-l)/2.0;

         if(sgn(f(mid))>) r=mid;

         else l=mid;

     }

     printf("%.4f\n",F(l));

 }

 int main()

 {

     int T;

     scanf("%d",&T);

     while(T--)

     {

         Solve();

     }

     return ;

 }