import java.util.*;
class Main{
  public static void main(String[] args){
    Scanner sc=new Scanner(System.in);
    String ss=sc.next();
    int ans=0;
    for(int i=0;i<ss.length();i++){
      ans=(ans+Integer.parseInt(ss.substring(i,i+1)))%9;
    }
           if(ans==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