import java.util.Scanner;
  public class Main {
    public static void main(String[] args) {
      Scanner scan = new Scanner(System.in);
      String N = scan.next();
      String M = "";
      int cnt = 0;
      for(int i=N.length(); i>0; i--){
        M = N.substring(i-1,i);
        cnt += Integer.parseInt(M);
      }
      if(cnt%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