static double Square(int a, int b, int c)
        {
            double p = (a + b + c) / 2;
            double s = Math.Sqrt(p * (p - a) * (p - b) * (p - c));
            return s;
        }
        static double Data()
        {
            WriteLine("Стороны треугольника");
            int a = int.Parse(ReadLine());
            int b = int.Parse(ReadLine());
            int c = int.Parse(ReadLine());
            double S = Square(a, b, c);
            return S;
        }
        static void Main(string[] args)
        {
            double S1 = Data();
            double S2 = Data();
            if (S1 > S2)
                WriteLine(S1);
            else
                WriteLine(S2);
        }