// 2023 IUSB Programming Competition
// Round 1 Problem 2
// Round To Even
// Solution by Liguo Yu

import java.util.Scanner;

public class round1_p2
{
    public static void main(String[] args)
    {
        Scanner input = new Scanner(System.in);
        double number = input.nextDouble();
        
        if(Math.floor(number)+0.5 != number)
        {
            System.out.println(Math.round(number));
        }
        
        else
        {
            int result = (int)Math.floor(number);
            if (result%2 == 1) result = result + 1;
            System.out.println(result);
        }
    }
}