#include <iostream>
#include <vector>
#include <cmath>
using namespace std;
const double EPS = 1e-10;
bool chez(double a){
    if(abs(a) < EPS) return true;
    return false;
}
int main(){
    double a, b, c, d, e, f;
    cin >> a >> b >> c >> d >> e >> f;
    double t = f - e;
    if(!chez(c)) t -= c * c /(4 * a);
    if(!chez(d)) t -= d * d / (4 * b);
    t /= a;
    printf("%.10lf\n", sqrt(t));
}