#include<iostream>

#include<cstdio>

#include<cstring>

#include<algorithm>

#include<cmath>

#include<cstdlib>

#include<ctime>

#define eps 1e-17

#define dt 0.98

using namespace std;

typedef double db;

db y,ans,ansx;

db pw(db a,int b)

{

  db ret=;

  for(;b;b>>=,a=a*a)

    if(b&)ret=ret*a;

  return ret;

}

db cal(db x){return *pw(x,)+*pw(x,)+*pw(x,)+*pw(x,)-y*x;}

void SA()

{

  db T=,x=ansx,lst=ans,tx,tmp;

  while(T>eps)

    {

      tx=x+(rand()*-RAND_MAX)*T;

      if(tx>)tx=; if(tx<)tx=;

      tmp=cal(tx); db delt=tmp-lst;

      if(delt<||exp(delt/T)*RAND_MAX<rand())x=tx,lst=tmp;

      if(tmp<ans)ans=tmp;

      T*=dt;

    }

}

int main()

{

  srand(time());

  int T; scanf("%d",&T);

  while(T--)

    {

      scanf("%lf",&y);

      ans=cal(); ansx=;

      SA();

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

    }

  return ;

}