#include <iostream>
#include <cmath>

using namespace std;

bool second(double a, double b, double c, double &x1, double &x2) {
    double D = b*b - 4*a*c;
    if(D < 0) return false;
    x1 = (-b+sqrt(D))/(2*a);
    x2 = c/a/x1;
    return true;
}

int main()
{
    long long Tf, Vf, Hf, Td, Vd, Hd;
    cin >> Tf >> Vf >> Hf >> Td >> Vd >> Hd;
    double Tf0 = sqrt(2.*Hf) + Tf;
    double Vdy = sqrt(6.*Hd);
    double Td0 = sqrt(2./3.*Hd) + Td;
    double ymn = Tf0;
    double xmn = Td + (Tf0 - Tf)*Vf/double(Vd);
    double a, b, c, x1, x2, x;
    bool res;
    cerr << Tf0 << "/" << Vdy << "/" << Td0 << " S\n";
    cerr << ymn << "/" << xmn << " YX0\n";

    a = 1.;
    b = Tf - Vdy - 3.*Td;
    c = Hf - Tf*Tf/2. + Td*Vdy + 3./2.*Td*Td;
    res = second(a, b, c, x1, x2);
    if(res) {
        if(Td <= x1 && x1 <= min(Tf0, Td0)) {
            ymn = min(ymn, x1);
        }
        if(Td <= x2 && x2 <= min(Tf0, Td0)) {
            ymn = min(ymn, x2);
        }
    }
    cerr << x1 << "/" << x2 << "/" << ymn << " Y1\n";

    a = -1./2.;
    b = Tf;
    c = -1./2.*Tf*Tf + Hf - Hd;
    res = second(a, b, c, x1, x2);
    if(res) {
        if(Td0 <= x1 && x1 <= Tf0) {
            ymn = min(ymn, x1);
        }
        if(Td0 <= x2 && x2 <= Tf0) {
            ymn = min(ymn, x2);
        }
    }
    cerr << x1 << "/" << x2 << "/" << ymn << " Y2\n";

    if(Vd != Vf) {
        x = (Td*Vd-Tf*Vf)/double(Vd-Vf);
        if(Td <= x && x <= Tf0) {
            x = min(xmn, x);
        }
        cerr << x << "/" << xmn << " X1\n";
    }

    x = (Td*Vd-sqrt(2*Hf)*Vf)/double(Vd);
    if(Tf0 <= x) {
        x = min(xmn, x);
    }
    cerr << x << "/" << xmn << " X2\n";

    cout.precision(15);
    if(ymn > xmn) {
        x = Vf*(ymn - Tf)/Vd;
        cerr << x << "Yx\n";
        cout << ymn + x;
    } else {
        x = Vd*(xmn - Td)/Vd;
        cerr << x << "Xx\n";
        cout << xmn + x;
    }

    return 0;
}