题解 | #计数器#

import java.io.*;
import java.util.*;

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);

        while(sc.hasNextLong()){
            long n = sc.nextLong();
            System.out.println(fun(n));
        }
    }

    public static long fun(long n){
        if(n <= 3){
            return 3 - n + 1;
        }

        int index = 1;
        long num = n;
        while(num > 3 * Math.pow(2, index - 1)){
            num -= 3 * Math.pow(2, index - 1);
            index++;
        }

        return 3 * (long)Math.pow(2, index) - 2 - n;
    }
}