using System;

public class Program

{

    public static void Main()

    {

        double x = 400000;

        var y = Math.Min(100000, x) * 0.01 + 

            Math.Min(100000, Math.Max(0, x - 100000)) * 0.02 + 

            Math.Max(0, x - 200000) * 0.03;

        Console.WriteLine(y);

    }

}