import java.util.*;
import java.lang.*;

public class Main
{
	public static void main(String args[])
	{
		Scanner sc=new Scanner(System.in);
		String n=sc.next();
		int a[]=new int [n.length()+1];
		int ans=0;
		for(int i=0;i<n.length();i++)
		{
			a[i]=n.charAt(i)-'0';
		}
		for(int i=0;i<n.length();i++)
		{
			ans=ans+a[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