using System;

public class Program

{

    public static void Main()

    {

        double pay=0;

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

        if(pay>=1000){

            pay=(pay*0.8);

            Console.WriteLine("消費金額:"+pay);

        }

        else

        {

            Console.WriteLine("消費金額:"+pay);

        }   

    }

}