using System;

public class Program

{

    public static void Main()

    {

        float a, b, S, P;

        Console.Write("a=");

        a = float.Parse(Console.ReadLine());

            Console.Write("b=");

        b = float.Parse(Console.ReadLine());

        S = a * b; P = 2 * a + 2 * b;

            Console.WriteLine("S=" + S);

            Console.WriteLine("P=" + P);    

        Console.WriteLine("Hello World");

    }

}