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

public class Main
{
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        String num = sc.nextLine();
        int total = 0;
        for (int i = 0; i < num.length(); i++) {
            total += Integer.parseInt(Character.toString(num.charAt(i)));
        }
        if (total % 9 == 0) {
            System.out.println("Yes");
        }
        else {
            System.out.println("No");
        }
    }
}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz