using System;

public class Program

{

    public static void Main()

    {

        int code;

        double min, cost;

        Console.WriteLine("Enter zone code: 12, 15, 18, 19, 23, 25 or 29"); 

        code= Convert.ToInt16(Console.ReadLine());

        Console.WriteLine("Enter duration of the call");

        min = Convert.ToInt16(Console.ReadLine());

        switch (code)

        {

            case 12:

                cost = min * 2;

                Console.WriteLine("The total cost of your call is " + cost);

                break;

            case 15:

                cost = min * 2.2;

                Console.WriteLine("The total cost of your call is " + cost);

                break;

            case 18:

                cost = min * 4.5;

                Console.WriteLine("The total cost of your call is " + cost);

                break;

            case 19:

                cost = min * 3.5;

                Console.WriteLine("The total cost of your call is " + cost);

                break;

            case 23:

            case 25:

                cost = min * 6;

                Console.WriteLine("The total cost of your call is " + cost);

                break;

            case 29:

                cost = min * 5;

                Console.WriteLine("The total cost of your call is " + cost);

                break;

        }

    }

}