using System;

using System.IO;

using System.Linq;

using System.Collections.Generic;

​

namespace CSharp_Shell

{

​

    public static class Program 

    {

        public static void Main() 

        {

           Console.WriteLine("Hello, World!");

           Console.WriteLine("Введите c");

           Console.WriteLine(3500);

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

            double z1=3*Math.Pow (Math.Sin(x+Math.PI),2);

                 Console.WriteLine(z1. ToString ());

        }

    }

}