import java.util.*;
public class Main {
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    
    // 入力値
    String input = sc.nextLine();

    int sum = 0;
    for (int i=0; i<input.length(); i++) {
      sum += Integer.parseInt(input.substring(i, i+1));
    }

    // 9で割れるか
    int amari = sum % 9;
    String result = amari == 0 ? "Yes" : "No";
    System.out.println(result);
  }
}

/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