#include<iostream>

#include<cstdio>

#include<cmath>

#include<cstring>

#include<algorithm>

#define LL long long

using namespace std;

int T;

LL y;

double cal(double x)

{

    return .*pow(x,)+.*pow(x,)+.*pow(x,)+.*x-y;

}

double mul(double x)

{

    return .*pow(x,)+.*pow(x,)+.*pow(x,)+.*pow(x,)-y*x;

}

int main()

{

    scanf("%d",&T);

    while(T--)

    {

        scanf("%lld",&y);

        double ans,l=,r=;

        while(r-l>1e-)

        {

            double mid=(l+r)/;

        //    cout<<mid<<endl;

            if(cal(mid)<=) ans=mid,l=mid;

            else r=mid;

        }

        double res=mul(ans);

        printf("%.4lf\n",res);

    }

    return ;

}