#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <queue>
#include <cmath>
#include <climits>
#include <iomanip>
#include <set>
#include <map>
using namespace std;
typedef long long ll;
int main(){
    ll a,b,c,d,e,f;
    cin >> a >> b >> c >> d >> e >> f;
    double res = 0;
    res += f - e;
    res += c*c / (4*a);
    res += d*d / (4*b);
    res = sqrt(res);
    cout << fixed << setprecision(10) << res << endl;
}