using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("how much toy one cost");

        double toyone = double.Parse(Console.ReadLine());

        Console.WriteLine("how much toy tow cost");

        double toytwo = double.Parse(Console.ReadLine());

        Console.WriteLine("how much toy three cost");

        double toythree = double.Parse(Console.ReadLine());

        double toyscost = (toyone+toytwo+toythree);

        Console.WriteLine("the toys cost: " +toyscost);

        Console.WriteLine("the toys cost befor the discount");

        double befordiscount = double.Parse(Console.ReadLine());

        double afterdiscount = (befordiscount-50);

        Console.WriteLine("the final price is: " +afterdiscount);

    }

}