#include<bits/stdc++.h>

using namespace std;

double tf, vf, hf, td, vd, hd;

double hft(double t) {
    return max(0.0, hf-(t-tf)*(t-tf)/2.0);
}

double hdt(double t) {
    return hd;
  //  return min(hd, 3.0/2.0*(t-td)*(t-td));
}

double dft(double t) {
    t = min(t, sqrt(2*hf)+tf);
    return max(vf*(t-tf), 0.0);
}

double ddt(double t) {
    return max(vd*(t-td), 0.0);
}

int main() {

    cin >> tf >> vf >> hf >> td >> vd >> hd;
    double x;
   /* while(cin >> x) {
        cout << hft(x) << endl;
        cout << hdt(x) << endl;
        cout << dft(x) << endl;
        cout << ddt(x) << endl;
    } */
    double hi=1000000000000.0, lo=tf, mid=0;
    for(int i=0; i<85; i++) {
        mid = (hi+lo)/2;
        if((hft(mid) > hdt(mid))||(dft(mid) > ddt(mid))) lo=mid;
        else
            hi=mid;
    }
    cout.precision(9);
    cout << mid+dft(mid)/vd << "\n";
}