#include <iostream>
#include <vector>
#include <math.h>
#include <iomanip>
#define PB push_back
#define F first
#define B back

using namespace std;

typedef long long int ll;
typedef vector<ll> vl;
typedef vector<vl> vvl;

double tf, vf, hf, td, vd, hd, ts, vhd, tpad, sispad;

int main(int argc, char const *argv[]) {


  cin>>tf>>vf>>hf>>td>>vd>>hd;

  vhd = sqrt(6*hd);
  ts = vhd/3.0;
  tpad = sqrt(2*hf);
  sispad = (tpad*vf);

  double l, r, m;
  l = 0;
  r = 1e6;

  while(abs(r-l) > 1e-5)
  {
    m = (l+r)/2.0;
    double vysf = hf-(m-tf)*(m-tf)/2.0;
    double sisf = vf*(m-tf);
    double sisd = vd*(m-td);
    double vysd = hd;
    if(m-td < ts)
      vysd = vhd*(m-td)-3.0*(m-td)*(m-td)/2.0;

    if(sisd >= sisf && vysd >= vysf)
      r = m;
    else
      l = m;
  }
  // cout<<"l: "<<l<<endl;
  // double vysf = hf-(m-tf)*(m-tf)/2.0;
  // double sisf = vf*(m-tf);
  // double sisd = vd*(m-td);
  // double vysd = hd;
  // if(m-td < ts)
  //   vysd = vhd*(m-td)-3.0*(m-td)*(m-td)/2.0;
  // cout<<vhd<<" "<<ts<<endl;
  // cout<<vysf<<" "<<sisf<<" "<<vysd<<" "<<sisd<<endl;
  //
  // cout<<fixed<<setprecision(10)<<2*l-td<<endl;

  double ans;
  ans = l+(vf*(l-tf)/vd);

  if(ans < td+2*sispad/vd)
    cout<<fixed<<setprecision(10)<<ans<<endl;
  else
    cout<<fixed<<setprecision(10)<<td+2*sispad/vd<<endl;

  return 0;
}