import java.util.Scanner;
import java.util.Comparator;
import java.util.Arrays;
import java.util.Collections;
class Main{
  public static void main(String[] args){
    Scanner scan = new Scanner(System.in);
    String S = scan.next();
    String[] split = S.split("");
    int N = S.length();
    long add = 0;
    for(int i = 0; i < N; i++){
      int a = Integer.valueOf(split[i]);
      add += a;
    }
    if(add % 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