using System;

/*
 * CIRCLE AREA CALCULATION PROGRAM
 */
namespace circlearea
{
    class CircleArea
    {
        static void Main(string[] args)
        {
            int     radius;
            double  area;
            string  myname;

            // first read the name of the user
            Console.Write("Please enter your name: ");
            myname = Console.ReadLine();

            // greet the user and then read the radius
            Console.WriteLine("Hello {0}! Welcome to my area calculation program", myname);
            Console.Write("Please enter the radius of your circle: ");
            radius = Convert.ToInt32(Console.ReadLine());

            // calculate the area of circle with given radius
            area = 3.14 * radius * radius;
            Console.Write("The area of circle is ");
            Console.Write(area);
        }
    }
}