import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

    public static void main(String[] args) throws IOException {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        String s=br.readLine().trim();
        long res=0;
        for(int i=0;i<s.length();i++){
            res+=(Integer.parseInt(String.valueOf(s.charAt(i))));
        }
        if(res%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