#include <stdio.h>
#include <vector>
#include <math.h>
#include <string.h>
#include <algorithm>
#include <string>
#include <map>

using namespace std;

#define REP(A,B) for(int (A)=0;(A)<(B);(A)++)
#define ld long double
int main()
{
	ld Tf, Vf, Hf, Td, Vd, Hd;
	scanf("%Lf%Lf%Lf%Lf%Lf%Lf", &Tf, &Vf, &Hf, &Td, &Vd, &Hd);
	ld tdrop = sqrt(2*Hf)+Tf;
	ld xdrop = Vf*(tdrop-Tf);
	ld tjump = sqrt(2*Hd/3);
	ld vjump = 3*tjump;
	ld LFT = Td, RGT = Td+2*xdrop/Vd;
	for(int its = 0; its < 50; its++) {
		ld MED = (LFT+RGT)/2;
		ld A = min(Vf*(MED-Tf), xdrop);
		ld AA = Vd*(MED-Td);
		ld B = max(Hf-0.5*(MED-Tf)*(MED-Tf), 0.0L);
		ld BB = vjump*(MED-Td)-3/2.0*(MED-Td)*(MED-Td);
		if((MED-Td) >= tjump) BB = Hd;
		if(A <= AA && B <= BB) {
			RGT = MED;
		} else {
			LFT = MED;
		}
	}
	ld RES = LFT+min(xdrop, Vf*(LFT-Tf))/Vd;
//	printf("%.8lf %.8lf\n", (double)LFT, (double)RGT);
	printf("%.8lf\n", (double)RES);

	return 0;
}