using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Add side a");

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

        Console.WriteLine("Add side b");

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

        double p;

        p=2*a + 2*b;

        Console.WriteLine("Rectangle circumference: "+p);

    }

}