import java.util.*;
import java.io.*;
public class Main {

	public static void main(String[] args) throws java.lang.Exception
    {		
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String s=br.readLine();
		long sum=0;
		for(int i=0; i<s.length(); i++) sum+=s.charAt(i)-48;
		System.out.println(sum%9==0?"Yes":"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