#include<bits/stdc++.h>

using namespace std;

const double e = 2.71828;

long double z(double x, double y) {
	return pow(e, -x * y + x + y - 1);
}

int main() {
	double a, b, h1;
	double c, d, h2;
	cin >> a >> b >> h1;
	cin >> c >> d >> h2;
	int zMax = -1e9;
	for(double i = a; i < b; i += h1) {
		for(double j = c; j < d; j += h2) {
			zMax = max(zMax, z(i, j));
		}
	}
	cout << zMax;
	return 0;
}