#include <iostream>
#include <iomanip>
#include<queue>
#include<math.h>
#include<algorithm>
#include<string.h>
#include<stdlib.h>
#include<stdio.h>
#include<iomanip>
#include<string.h>
#include<sstream>
#include<string>
#include<queue>
#define MAX 5842
//¶¨Ò庯Êý¶Î
#define repf(i,a,b) for(int i =(a);i<(b);i++)
#define repfe(i,a,b) for(int i =(a);i<=(b);i++)
using namespace std;

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

double getTendency(double x ,double y){

return 42*pow(x,6)+48*pow(x,5)+21*pow(x,2)+10*x-y;
}
double getRes(double left ,double right  ,double y)
{
    if(getTendency(100.0,y)<0)
    {
        return getTemp(100.0,y);
    }

    double res, mid = (left+right)/2;
    if(fabs(getTendency(mid,y)-0)<1e-10)
    {

        return mid ;
    }
    else if(getTendency(mid,y)<0)
    {
       res =getRes(mid,right,y );
    }else if(getTendency(mid,y)>0)
    {
       res =getRes(left,mid,y );
    }
    return res ;
}

int main() {

    int num ;
    double y ,res;
    cin >> num ;
    while(num--){
        cin >> y ;
      res = getRes(0.0,100.0,y);
        printf("%.4lf\n",getTemp(res,y));
    }
    return 0 ;
}