import java.io.*;
 
/**
 * Created by Ayushi on 22 Aug 2020.
 * Problem:
 * Round:
 */
 
public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        
        String a  = br.readLine();
        long ans = 0;
        for (int i = 0; i < a.length(); i++) {
          ans += Integer.parseInt(a.substring(i,i+1));
        }

        System.out.println((ans%9==0) ? "Yes":"No");
        //System.out.println(ans);
    }
}
/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