using System;

public class Program

{

    public static void Main()

    {

        string CP;

        double TC, TRP;

        TRP=0;

        TC=0;

        Console.Write("Total de la compra $ ");

        TC=Convert.ToDouble(Console.ReadLine());

        Console.Write("Credencial presentada: 1.Ninguna, 2.Estudiante, 3.INSEN ");

        CP=Convert.ToString(Console.ReadLine());

        if (CP=="2")

            TRP=TC*0.10;

        else

            if

                 (CP=="3")

                TRP=TC*0.25;

        else

            TRP=TC;

        Console.WriteLine( " ");

        Console.WriteLine("===================================================");

        Console.WriteLine("Total realmente pegado (con despuento) es: $ " + TRP);

        Console.WriteLine("---------------------------------------------------");

    }

}