#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;
typedef long double db;

db 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);

  db l, r, m;
  l = td;
  r = tf+tpad+1e6;

  while(abs(r-l) > 1e-7)
  {
    m = (l+r)/2.0;
    db vysf = hf-(m-tf)*(m-tf)/2.0;
    if(vysf < 0)
      vysf = 0;
    db sisf = vf*(m-tf);
    if(sisf > sispad)
      sisf = sispad;
    db sisd = vd*(m-td);
    db 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;
  // db vysf = hf-(m-tf)*(m-tf)/2.0;
  // db sisf = vf*(m-tf);
  // db sisd = vd*(m-td);
  // db 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;
  db sisf = vf*(m-tf);
  if(sisf > sispad)
    sisf = sispad;
  db ans;
  ans = l+(sisf/vd);

  cout<<fixed<<setprecision(10)<<ans<<endl;

  return 0;
}