using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Naem?");

         var rent= int.Parse(Console.ReadLine());

        var stat= 0.7* rent;

        var cater= 0.85* stat;

        var sound= 0.5* cater;

        var sum=stat+cater+sound+rent;

        Console.WriteLine("Сумата е "+sum);

    }

}