import java.util.*;
import java.io.*;
public class Main
{
	public static void main(String args[]) throws IOException
	{
		
		BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		String n="";
		n=br.readLine();
		long ans=0;
		for(int i=0;i<n.length();i++)
		{
			ans+=Long.parseLong(""+n.charAt(i));
		}
		if(ans%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