using System;

​

public class Program

{

    public static void Main()

    {

        double base , 

        hight , 

        c , 

        p , 

        s;

        base = double.Parse(Console.ReadLine());

        hight = double.Parse(ConsoleReadLine());

        s = (base * hight) / 2;

        c = Math.Sqrt(Math.Pow(base, 2) + Math.Pow(hight, 2));

        p = base + hight + c;

        Console.WriteLine("s={0}", s);

        Console.WriteLine("c={0}", c);

        Console.WriteLine("p={0}", p);

    }

}