using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(Calculate(5, 4, 5));

    }

public static decimal Calculate(decimal amount, int type, int years)

  {

    decimal result = 0;

    decimal disc = (years > 5) ? (decimal)5/100 : (decimal)years/100; 

    if (type == 1)

    {

      result = amount;

    }

    else if (type == 2)

    {

      result = (amount - (0.1m * amount)) - disc * (amount - (0.1m * amount));

    }

    else if (type == 3)

    {

      result = (0.7m * amount) - disc * (0.7m * amount);

    }

    else if (type == 4)

    {

      result = (amount - (0.5m * amount)) - disc * (amount - (0.5m * amount));

    }

    return result;

  }

}