import java.util.*;

public class Main{
  public static void main(String[] args){
  	Scanner sc = new Scanner(System.in);
    
    String n = sc.nextLine();
    
    int sum = 0;
    for(String s:n.split("")){
      sum += Integer.parseInt(s);
    }
    
    if(sum%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