import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        double a = sc.nextInt();
        double b = sc.nextInt();
        double c = sc.nextInt();
        double d = sc.nextInt();
        double e = sc.nextInt();
        double f = sc.nextInt();
        double pow2 = f - e + c * c / a / 4 + d * d / b / 4;
        System.out.println(Math.sqrt(pow2 / a));
    }
}