using System;

​

​

public class Calculator

{

    public 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;

    }

}

​

public class Program

{

    public static void Main()

    {

        var calculator = new Calculator();

        decimal result = calculator.Calculate(10, 2, 2);

        Console.WriteLine(result);

    }

}