import java.util.*;
public class Main{   
public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
  String  a = scanner.next();
        char[] chars = a.toCharArray();
        int sum =0;
        for (char aChar : chars) {
            sum+= aChar-'0';
        }

        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