
import java.util.*;

public class Main {

	public static void main(String args[])
	{
		Scanner sc=new Scanner(System.in);
		String n=sc.next();
	//System.out.println(n.length());
		int sum=0;
		for(int i=0;i<n.length();i++)
		{
			sum+=(int)n.charAt(i)-48;
		}
		
		if(sum%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