import java.util.*;

public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    String line = sc.nextLine();
    int l = line.length();
    String NumSt[] = new String[l];
    NumSt = line.split("",0);
    int dig;
    int sum = 0;
    
    for(int i = 0; i < l; i++){
      dig = Integer.parseInt(NumSt[i]);
      sum += dig;
    }
    
    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