//
#include <bits/stdc++.h>
using namespace std;

#define fi first
#define se second
#define all(x) x.begin(), x.end()
#define lch (o << 1)
#define rch (o << 1 | 1)

typedef double db;
typedef long long ll;
typedef unsigned int ui;
typedef pair<int, int> pint;
typedef tuple<int, int, int> tint;

const double EPS = 1e-5;
const int INF = 0x3f3f3f3f;
const ll INF_LL = 0x3f3f3f3f3f3f3f3f;

int main() {
	ios::sync_with_stdio(0);

	double a, b, c, d, e, f;
	cin >> a >> b >> c >> d >> e >> f;
	assert(a != 0 && b != 0);
	if (a != b) {
		cout << fixed << setprecision(10) << 0.0 << endl;
	} else {
		double r = sqrt((f - e) / a + pow(c / 2 / a, 2) + pow(d / 2 / b, 2));
		cout << fixed << setprecision(10) << r << endl;
	}

	return 0;
}