//package atcoder.beginnercontest.r176;

import java.util.Scanner;

/**
 * @author pribic (Priyank Doshi)
 * @since 29/08/20
 */
public class Main {

  public static void main(String[] args) {
    try (Scanner sc = new Scanner(System.in)) {
      String n = sc.next();
      int sum = 0;

      for (char c : n.toCharArray())
        sum += (c - '0');
      System.out.println(sum % 9 == 0 ? "Yes" : "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