How do I can remove these errors?

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;


namespace BC170401685
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Enter the Numeric Characters of Your VU ID as your Assets"); ;
            int vid = Convert.ToInt32(Console.ReadLine());

            Console.WriteLine("If you want to calculate Zakat of Your amount in rupees Then Press 1" +
                "\nIf you want to calculate Zakat of your amount in Gold Then Press 2" +
                "\nIf you want to calculate Zakat of your amount in Silver Then Press 3" +
 
                int option = Convert.ToInt32(Console.ReadLine());

                switch (option)
                {
                    case 1:
                        Zakat z = new Zakat();
                        z.zakat_Calculation(vid);
                        break;
                    case 2:
                        Zakat g = new Gold();
                        g.zakat_Calculation(vid);
                        break;
                    case 3:
                        Zakat.s = new Silver();
                        s.zakat_Calculation(vid);
                        break;
                    default:
                        Console.WriteLine("Enter Correct Number");
                        break;
                }
        }
    }
}

int option = Convert.ToInt32(Console.ReadLine());

                switch (option)