import java.util.*;
import static java.lang.System.*;

class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(in);
      String s = sc.next();
      int sum = 0;
      
      for(int i=0; i<s.length(); i++){
        sum = sum + (s.charAt(i)-'0');
      }
    if(sum % 9 ==0){
      out.println("Yes");
}else{
      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