Calculate Rectangle Area

using System;

class Program
{
    public static void Main(string[] args)
    {
        double first = double.Parse(Console.ReadLine());
        double second = double.Parse(Console.ReadLine());
        double area=RectangleArea(first, second);
        Console.WriteLine(area);

    }
    public static double RectangleArea(double a,double b)
    {
        return a * b;
    }
}