package com.company;

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Integer value = new Scanner(System.in).nextInt();
        if(value % 2 == 1)
        {
            System.out.println(value.toString());
            return;
        }
        Integer half = value / 2;
        System.out.println(half.toString());
        return;
    }
}