import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

class Main {
	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int num = Integer.parseInt(br.readLine());
		br.close();
		if(num%2==0){
			System.out.println(num/2);
		}else{
			System.out.println(num);
		}

	}
}